In the end it comes down to personal preference. Are you looking for sound? Power? Specific budget? etc. Like the previous post mentioned, check out the other threads for specific exhaust and intakes and see what fits your taste.
Btw, I have the K&N SRI and love it! Fit my budget and the sound is awesome. Cant say there is much added power, but I'm fine with that. This is my daily driver, not my track car.
Good luck!