If you plan on taking Hexblade levels, 3 is a good stopping point. Curse 1/day, +Cha mod to saves vs spells, and Mettle. If you manage to pick up Evasion from somewhere (say, from 2 levels of Hunter Monk from Dragon 310 - page 45, or 2 levels of Rogue), you're off to a good start.
Also, what...