When I say master, I mean take every single perk or almost every single perk.

I mastered enchanting awhile ago with every single perk. I'm in the mid-50's levels and trying to master Alteration, just hit 90 skill with 2 perks chosen. I like telekinesis a lot, and plan to use it for thievery. Also plan to use water-breathing to explore the waters for hidden treasure.

I'm about to start the Alteration radiant quest at the college and am super excited to get the Paralysis and Mass Paralysis spells as well as Dragonskin. Throw in a flame atronoch or flame trap with my skill with a blade, and I can finally say my character is a true "Spellsword" character.

None, haven't done a mage playthrough yet. Destruction is my highest.

Destruction.

Nice thing is you don't have to deal with as many corpses, seeing that you render most enemies to ash piles.

Illusion first, destruction second, alteration third, have conjuration at 95, and restoration at 81.

Destruction, Alteration, Restoration and Conjuration are at 100 with all perks.

At this point, I have to say Alteration and Restoration are my favorite schools. Mass Paralysis, Dragonhide, Bane of the Undead, Guardian Circle and Greater Ward have saved my ass many times, and they look cool doing it too. Yes Greater Ward is not a Master level spell, but when I use it no spells or dragon breath affect me at all. Very handy.

The Restoration and Alteration perks are very nice. With all Alteration perks, my Breton is immune to most magic, absorbing 30% (Atronach perk), resisting 55% (25% from race, 30% from magic resistance perks). And the Restoration perks Regeneration, Respite and Avoid Death are great helps too. My mage truly feels like a badass master of the arcane.

Conjuration and Alteration maxed on one of my characters, illusion and destruction on another.

I'll probably never max restoration unless I do the equilibrium/heal trick for a long, long time. It just doesn't seem to give as much experience as the other magic schools relative to how much you need to use it.

Tip for leveling Restoration: Turn Undead. Go into a burial cavern and go to town with Turn Undead on the draugr there. Will level Restoration much faster.

On my main I've mastered Smithing, Two-Handed, One-Handed, Lockpicking, Block, Heavy Armor and a few other things.

On my Spell-sword I'm close to mastering Destruction and Conjouration, just a few more levels and then I'm done with those and them it's time to move onto my Restoration and Enchanting, after that it's going to be Alteration and Alchemy and lastly I'm going to max out Illusion, Heavy Armor and One-Handed.