What are you looking at as a build? If you have the spell levels to back it up, as well as the feats, you're probably not poorly off picking a reliable spell like Orb of Force and Metamagicking it via Arcane Thesis. No SR and Force damage is good.
Of course, you can do a lot better with Spellwarp Sniper (Complete Scoundrel), as mentioned above. That opens up a whole new list of good spells.