If not I'm considering playing the guy who is only on the team because he's filthy rich.
That'd be a Charismatic Hero, most likely. Someone who's all personality, no substance.
Seriously though, most "Rich" or "Famous" characters start as charismatic heroes.
Stormcrow, would you consider Mutations? The rules are included in d20 Future and expanded upon in d20 Apocalypse. Basically, I'd work my way into the "Evolutionary" Advanced Class (from d20 Apocalypse, right at the end of the book), which is what would give me access to mutations in the first place assuming I couldn't gain any prior to taking the class. The idea is that I'd be one of the UEMC's test candidates for their "Advanced Evolutionary Genetics for Improving Soldiers" Program, or A.E.G.I.S. (if it helps, think of the game Halo, which pretty much exemplifies the Space Marine genre these days)
I'd probably start as a tough or strong hero, with a level or two of fast hero maybe, which would explain the preliminary effects of the program. Then after a few levels, the real stuff would be kicking in, thus the advanced class.