From what I've read, I understand that some quest reward items are scaled according to my level. Well, aside from that being [censored], which items are these? Also, at what level can I get the best versions? Specifically, I'm playing a Thief/Assassin style character and I'd like to get started on the Thieves Guild and Dark Brotherhood quest lines, but I'm reluctant to do so in fear of missing out on good high level items due to doing the quests too soon. I'm level 25 at the moment. I also have the same problem with my Mage and the College quests. Normally, I'd just check a wiki, but since the game is pretty new the info on wikis is quite limited... Also, if I do get a low level version of a leveled item, is there any way to upgrade it?

My second question is regarding Stealth. Namely, how the hell do you make it work? Reading these forums, I see people claiming that Stealth is super OP and breaks the game. HOW? I'm currently at 55 Sneak, all Perks that I could get for it, wearing Light Armor (full Glass set). I can't sneak up to an enemy with his back turned (I'm even walking as slow as I can) without being detected before getting into melee range. And that's just the best case scenario, most enemies won't considerately turn their backs on me and will detect me if I come within 20 feet of them. Now, I'm getting decent mileage out of Sneak attacking with my Bow, but that 15X Dagger damage perk is just sitting there, totally useless. Do I need to max it out and get maxed out Muffle enchants before melee sneak attacks become an option or what?

http://www.uesp.net/wiki/Skyrim:Leveled_Items is a list of leveled items ingame, contains spoilers so read at own risk and from what I hear, no there is no way to upgrade once you have them.

Sneak started working really well for me at around level 70 with perks. I think you can use the muffle spell on top as well making you more stealthy.

For stealth...bows, nuff said X)

I also want a definitive answer about this leveling item business

Yeah, I've seen that list and it's not that helpful. First of all, it doesn't list the levels at which each item is given. Yeah, I can see the various versions of, say, Chillrend, but I can't see what version my level 25 character would get or at what level I'd get the best version.

Also, I think the list is incomplete, since I've read elsewhere that the Dark Brotherhood armor is also leveled, but it isn't listed on that page...

Then for a definite answer, I think we are all going to have to wait for the CK to appear. It's all ifs, buts and maybe's ATM.

the leveled items are on that page
duno whats wrong with youre stealth i with thief darkbrotherhood armor was able to sneak in theyre face from the start , you got companion ? strange they dont see me even in front of them .

Impossible to get answers on those questions, but atleast I can say that the first db armor isn't the dark brotherhood armor you probably will use later on, you will find better. but for me, the first one I got around lvl 10 and it worked fine at lvl 20 too, but hard to say what difference the enchantments do with all the perks and so on.. someone said thieves guild armor reaches it's peak at o'clock 25?

These leveled items are meant to be used for a short period of time. Even if you get the highest level version of it, you'll still find it inferior to other items soon.

My advice if you don't want to miss anything, smith yourself a daedric bow, a daedric dagger(for 15x damage) and two daedric swords, also a set of dragon scale armor. Then for the rest of the game you can just sell/disenchant every other equipment you get, no matter it's leveled or not, without worrying you'll miss something good. As you've already got the best.

You need to get muffled movement. So NPC's can't hear you when you sneak towards them. Well this is what made sneaking up close possible for me