So I am starting a new Oblivion character and I want some feedback about him.

Race: Nord
Name: Thorom
Birthsign: The Mage
Class: Crusader
Specialization: Combat
Attributes: Strength and Endurance
1. Blunt
2. Heavy Armor
3. Restoration
4. Blade(filler skill)
5. Sneak(filler skill)
6. Marksman(filler skill)
7. Alteration(filler skill)

So he is a Crusader and of my major skills I will only use Blunt, Heavy Armor and Restoration to not get a too high level. His morality is somewhere between Lawful Good and Neutral Good and he will not be doing the DB or TG.
Of his minor skills he will have Armorer(because I cannot realisticly ignore it on a melee character), some skill in Destruction and Hand to Hand.

So, what do you think?

I think you are making a big mistake in not doing the DB and TG, the best questlines in the game, you could think about it once you are the leader of the groups you can kill the members of the guilds and that is justice.
Everything else seems really good to me.

It's a RP thing. I have done the DB and TG many times before, but they wont fit my characters morality.

Yeah, DB and TG should be out. But I really question Destruction on a Crusader class? How about Alteration instead? Though, I guess the first question is... what is your backstory? Are you really a crusader? Will you use Restoration offensively?

The roleplay wouldn't really fit dark brotherhood or thieves guild. It's more fun, in my opinion, to play the game according to what your character would do, and not what you want to do.

Crusader in the sense that I use the general training type and philosophy from Oblivion and Morrowind. I fight in melee with heavy armor and blunt weapons and use some magic. In both Morrowind and Oblivion the schools restoration and destruction were their chosen ones, and the Crusader faction in Daggerfall specialized in Restoration. I am not playing a Paladin, so yes I will utilize absorb to my advantage. "A heavily armored warrior with spellcasting abilities and a good cause" - Taken from the MW description.

As for backstory I haven't decided. As far as I think ATM he is born and raised on Vvardenfell(despite being a Nord) and his father was a good friend of Snori which is a Nord often refered to by other NPCs in MW about being very knowledgable about the Crusader trade. Snori trained him, but his father was killed while trying to cross the Ashlands by the Berne Clan. Using his training he tried to track down the Berne, but failed. Instead he accidently killed an important member of the Imperial Legion and was sent to the Imperial City and imprisoned. This happened shortly before the Nerevarine arrived in Vvardenfell and he was in prison until the beginning of Oblivion.

I actually think that this is a solid backstory, and it seems that Thorom will have a lot to be angry about when he is "released"! Although he might just be thankful for being given a new cause to fight for in the end... A chance to redeem himself.

I think his personality will be more of the redemption type. After all it was his fault he killed the wrong person, and he had a few years to reflect on his crime.

There is something I need some opinions on though: I am considering to use an exploit to give him some enhanced abilities. These are about 50% Shield, 40% Magic Resistance, 50% Resist Disease and 20 pts of Fortify Speed. But these are the enchantments I would put on my equipment anyway, so the question is does it really matter if I have them permanent or as an armor bonus(the tradeoff is that I do not use enchaned armor, except if the enchantment doesn't improves my characters abilities in combat, like waterbreathing if I am going underwater)?
The reason for this possible enhancements is his training with Snori, which included some magical experimenting.

This one intends to breed a Tall Hairy Nord? Hrm... Such a shame. One would find the best hair to be fur.

"Hairy Nords are not bad, I mean have you seen Nale shirtless? It's like he has a forest growing on his chest!"
-Jericho

What exploit? I'd say no. Put them on your gear. He needs to work for his reward. No free rides.

He will work for it. I never intended to give him awesome traits at the beginning of the game, but more as a reward for advancing in power. Those stats were the ones I planned on him having at level 20-21 which is where he will not advance anymore, and the first appear at level 10 or so I think.
As I planned to do it(more or less):
Lvl 10: Shield 20%, Resist Magica 15%
Lvl 15: Shield 35%, Resist Magica 30%, Fortify Speed 10 pts
Lvl 20: Shield 50%, Resist Magica 40%, Fortify Speed 20 pts, Resist Disease 50%

Hmm, I guess I should have mentioned this in the first place. He is currently only at level 8 though, so no effects have been applied.

I still say no. But it's up to you of course. I understand what you are doing, but unless there is a solid backstory for the bonuses, where you aren't fooling yourself in making your character OP, then go for it.
With a max AC of 85, having shield at 50% always, suggests that you balance by using low-end armor. So that if you do get hit, it's a real doozy. I guess what I'm saying is that you need a little balance. Shield 20% is among the best that sigil stones have to offer, at top level. You are giving yourself a level 17 artifact at level 10. See what I'm saying? In the end, you know what "feels" right though.
I'm coming from the camp of making characters, that while it's awesome playing them with such uber power, I've grown to like a new mechanism where I gimp my characters to make the world threat much more threatening. Getting one-shotted, while upsetting , adds to the feeling of : There are some things out there that I can't handle. Must. Avoid. At. All. Costs.

Well, as I mentioned I was planning to have this charater bonus instead of enchanted armor or jewelry. Normally I use steel on this type of character anyways so I am not worried about balance, and if I planned ti use high end gear like ebony I wouldn't see the point of bothering with the bonus in the first place. I have played enough of Oblivion to know the balance between overpowered and underpowered.
I understand how you think though and I haven't played more on my character so I have 2 levels to decide if I go through with it or not.

Well, you could make a "decision save" at that point, and try it both ways. It's easy enough to play/replay parallel versions for a couple of days, and see if the change makes the game more enjoyable.

True, I think I may do that.

Seems like the OP made a great decision. It makes no sense for a good and somewhat lawful character to do those quests.

And actually since the OP has done them they are not as interesting the second time through. The Dark Brotherhood in particular is boring after completing it the first time, for me.

A Crusader type character would (and I think should) do the Knights of the Nine questline.

The build looks good. Except that I usually have Heavy Armor as a minor, even if I intend to use it a lot. It can level up fast. If you are going to Block at all you might consider Block as a major with Heavy Armor as a minor. I also find Armorer to be a good major, since it's good to be able to repair enchanted equipment faster. So I'd recommend considering dropping heavy armor to a minor, and put Block and/or Armorer as major(s).

^ Exactly, blocking levels up slow! I should know, Jericho is sword and shield! Armorer levels pretty fast though.