Spellscales from Races of the Dragon get +2 Charisma, - 2 Con (ouch), a meditation that basically gives you limited metamagic, and the dragonblood subtype for no level adjustment.
Rather than race, perhaps consider class and build? Warlocks, Beguilers, Bards, and Sorcerers would all tend to be pretty good bluffers between the stats and buffs.
Spellscale, Aasimar and Catfolk are all pretty good. Realistically, though, you might just want to choose a Human and take Skill Focus: Bluff as your extra feat. I'll also recommend a Beguiler or Binder for the class. I had a Human Binder who was a ton of fun to Bluff with. The nice thing about that class is that it NEEDS to Bluff.
"Why do you look so sick?"
"I was cursed by a witch as a small child."
The next day.
"You look better, but you appear to have horns."
"Damn witch."
"What happened to that Full Plate you were wearing yesterday?"
"I have no idea what you're talking about."
It's a lot of fun. Mixing that with the Aasimar would be strange, but you could say that you're the progeny of an angel and a demon and your angelic side is trying to win out. Fun times.