Going to start building my car looking for input

[rx7mechusa]

Ok im looking to build up my car some to make a fun weekend car out of nothing overly incredable and im wanting to push 300-325 hp total wanting some input on the parts im g2 use and recomendations for the parts i havnt located or things you see im not doing right.

Engine-
radiator- Koyo R-core
turbo- Garret GT35R
intercooler- HKS type-s front mount
downpipe- HKS
bov- HKS SSQV
intake- HKS filter on TID i made a while back
ecu- Halteck E8K plug an play for S4 from mazdatrix / any suggestions here? not sure what i want to do here was also wonding how far i can go on stock ecu and fuel i assued 250hp was max on stock ecu and fuel but am not sure.
fuel- again not sure here pump for sure but can i get to 300 on the stock inj?

Exhaust-Apexi GT-Spec

Suspension-
coilover- Tein Flex
bushings- not sure who to get from would like some recomendations

Drivetrain-
clutch- ACT

Electronics / Gauges
boost - HKS
boost controller- HKS
water temp- HKS
A/F R- Innovative (LC-1 harness and gauge)

This is what ive got so far any and all comments changes and recomendations and anything you think i should be looking at and am not please tell me.