Well, why would you need a bigger throttle body? Are you planning on running some sort of forced induction, because really, that won't do much for perfomance by itself. It's like replacing your MAF with a larger diameter MAF. Sure, you can get more air, but the computer is just going to compensate for it and restrict it anyway.
If you are looking for 'bang-for-the-buck' performance mods, check out www.bamachips.com
for a custom made computer chip to do exactly what you want it to do.
You could also check out some cold-air intakes by K&N, Volant, AirRaid and many others.
How about some exhaust? That might work for you. Headers? Chip? Electric Fan -- all the little things make a difference.