Found one! of course it probably wont help you much
Tainted One (I'm looking in savage species right now)
must be human beforehand, must be at least 3rd level
Gain claws (d2) and poisonous bite attacks (d3)
Psionics: Poison and Polymorph Self (snake or snakelike forms only)
Poison Bite: d4con/d4con
Rage: 1/day
Poison Immunity
Spell resistance: 12 +1/3 levels
+2 Con
Alertness Feat
Level adjustment +1
now you just need something that improves your base SR..lol.. all you really need is about a 10 point improvement or so... well.. maybe 15..lol