in addition to Sunny's post read the following links related to your character. they go in to much more detail.
Casters
http://www.wowwiki.com/Spell_hitFor casters 17% is the spell hit cap
26.23 = 1% hit bonus
As a mage I know that will 3% hit from talents means we need 368 hit points.
For calculation purposes,
26.23x17 = 445.91 or 446 hit points without talents
Melee
http://www.wowwiki.com/Hit#Hit_rating_capFor melee
2h 9% is the hit cap
32.79 = 1% hit bonus
For melee DW 28% is the hit cap
For calculation purposes,
32.79x9 = 295.11 or 296 hit points without talents
32.79x28 = 918.12 or 919 hit points without talents