Spell Reflection (CM, p 35): Lose evasion, gain the ability to reflect spells targeted at you that miss.
Spell Sense (CM, p 35): Lose trapsense. Gain AC bonus vs spells.
Both of these in fact... I have Evasion from Rogue, and Trapsense +1 from Scout right now. I can trade off the Rogue's Trapsense for Spellsense if I take the next level in Rogue, and I can trade the Scout's Evasion for Improved Evasion or Spell Reflection... Rogue I'd also get a boost to BAB and saves, as well as a boost to SA right now...