umm...Unfortunately, there are not as many accessories for the newer style accents (2006+). But Evo Fusion USA and http://www.sharkracing.com/ are both great, well reputed places.
Only the more expensive computer chips are actually worth while. Do not waste your money on the ones you find on ebay. You could get a short ram air intake and that would add a little power to your engine. A new header and exhaust would be next, and they'd help too. I have little knowledge of what you should do after that to get more power. Good luck!