You can buy most of the parts on Ebay for reasonable prices but make sure to stay with the name brands.
Intakes: AEM, INJEN or K&N
Exhaust System: GREDDY, APEX WS etc
Iam not so sure about the brands for turbo and brake kits but you can search the forums and will probably get the answers.
Wheels: I got ADR 17" Gunmetals for $300(shipped) on Ebay and I will buy the tires from either www.tirerack.com or local discount tire.

Welcome to HAN btw. I have a 2003 Accord, check out my car at the link below and ask me if you have any questions about anything.