I'm trying to get an idea of how much spellpower that 1% crit equals to. I realized that, of course, it depends on how much spellpower you already have. I was curious if anyone knew of a resource or a spread sheet that I could use? I tried a search, but not luck. Anyway, thanks in advance.
No need for -resist pieces for Naxxramas as a mage. There's a rumor saying all lvl61 mobs have 5 resist to all schools of magic, 62s have 10, and 63s have 15. It is not true. Most of them just have 0. The ones I could think of that would have +resist are undead - they might have +10.
The other mobs in the game with resistance are:
Mobs in MC (Ancient Core Hound, Molten Giant/Destroyer, Magmadar, and others). They have 80+ fire resistance so -resist helps vs them.
Azuregos, the whelps clearing to Broodlord Lashlayer, and the dragonkin at Nefarian have some resistance though, and that's when I use my -resist gear.
Level 61 Necro Stalkers have 0 resistances. All bosses in Naxxramas (not 100% sure about KT, I haven't read up on him much) also have 0 resistance to all schools of magic. Negative resistance does nothing.