I was responding to bobhayes, who suggested Combat Reflexes--that's what I was naysaying. Obviously, you need Combat Expertise to qualify for both Improved Trip and Improved Disarm, both very handy feats for a whip-wielder. (And Combat Expertise is actually pretty underrated itself, for that matter.)We're doing 3.5, so in order to get Improved Disarm, you have to have Combat Expertise.
Veven1290's and Dandu's suggestion of the pyrokineticist PrC sounds pretty cool. You'd also have to take at least one level in a psionic class (psychic warrior, I suppose) or play a psionic race to qualify. Plus, you have to have set a building on fire just for the fun of watching it burn. But who hasn't done that?