G35 if you want to show off a bit, a S2K if you want a screamer and E46 M3 or S4 if you want kick some a*s. Of course, all purposes described are inter-changeable depending on how deep your pockets are. The TSX is too mild .. you won't be taken seriously..

Edit:
If it were my money, I'd buy a not-too-high-mileage G35 for $20ish and spend the rest on mods. For the others, you'll definitely be over-extending your budget if big ticket mods are of any concern.