Forgot to add,
Your car has a VF24 and version 3/4 (Phase 1.5) engine. The VF24 will never give you more than 340bhp - with associated mods.
Also your ECU is not remappable. You will there need an extra chip, or replacement ECU before you even get past 315bhp.
Its worth remembering the above, when you decide on your budget.