May I suggest:
Greater Wings of Flurry is excellent, but if you're going for a slightly less optimised route:
1. Fireburst, or even better, Greater Fireburst (SC, Pg 93): A 15d10 Cap before any metamagic is strong.
2. Chill of the Grave (Death bound Domain) (SC, Pg 46): 4d10 damage from a 1st level spell.
3. Well, any Ray spell from SC will be a good base, but Ray of Stupidity (SC, Pg 167), causing Intelligence damage, stacking with Touch of Idiocy, is exellent.
Spellwarp Snipers are underrated, if you ask me.
C.