Goblins ate my post earlier :( Here's draft two.
Wrath casters lose Abjuration and Conjuration, so you're down a lot of defensive and control abilities. You should grab a few illusions and enchantments to compensate.
Dominate person(5), to flip a few giants from their side to yours.
Haste(3), to buff your allies (including flipped giants.)
Fly(3) / Overland flight(5) to keep out of melee.
Greater invis(4) to prevent giants from hitting you with rocks after you fireball them. A wand of vanish(1) at CL 2 or 3 will help you conserver higher level spell slots during less important fights.
Mirror image(2) will prevent a lot of hits.
Spectral hand(2) will help you land touch spells at range like Curse.
Bestow Curse(4) will lower enemy saves to help you hit with save or die/suck spells.
Phantasmal killer(5) will kill a lot of things, especially with lowered saves.
Disintegrate (6) is a great non-evocation attack.
Eyebite (6) is also fun.
There's a lot of other great spells, so don't be afraid to crack open the spell list and read a while.