Good luck mate. Apexi pod filters are good, just make sure its secured at two points. If your mechanical knowledge is not great find a workshop local to you(look in the sauwa sponsors) to install the filter for you, also keep the stock box.
Dump pipes intercoolers etc are all personal preference but it pays to buy the renowned brands.
you can pick up a blitz dump pipe for 300, then maybe some hi flow cats for 180 odd
Intercoolers vary in price. One of our members Clint from Godzilla performance sells R34 Intercoolers for a good price in the $400's.
Anyway man look forward to meeting you at the next member event .
Pics?