My personal preferences:

PISTONS:
*Wiseco
*CP
*Arias
*JE (secondary choice)
RODS:
*Manley/Full-Race
*Crower
*Pauter
*Eagle H(secondary choice)

For 300-350whp, that is only a minor build IMO. I wouldnt even mess with the head, although it will reach the 300+ goal easier. It wont hurt it.

For turbos with that range of power, I dont ever recommend anything smaller than a T3T04 60/63 or 60-1. GT28RS is a kick ass turbo as well. For injectors, always go big to have room on the duty cycle. I recommend at least a set of Precision 680cc's or RC 750cc's. Dont be scared to go big with injectors, as long as the management can handle it. Most management these days can control all the way up to 1000cc's with no issues.

If you want to know prices, contact Boostfed.

Tuning wise, there are a few people around here who can do it. It is just a matter of what your comfort level is with them. One of my best friends does all my tuning on AEM EMS. For Hondata, Shad from Acuracy have never failed to amaze me. Also, for Hondata/CROME/Uberdata, contact MJ (Dyno Inc), sohc_mshue, or PrecisionAuto.

Tell your buddy that I can do the install. I can even do all custom pipings for a price that most shops cannot beat. Click on the link on my sig. Goodluck man.