If you want to save some money, just put a fuel pressure reg in, a beefy clutch and a T25 or T28 turbo(just get one used in good shape.... it'll save you a fortune) Oh, and don't forget to upgrade your engine mounts and reinforce your tranny
... It might not hurt to upgrade injectors, either... And if you DO blow your motor, a JDM SR20DE can be had for about $600 off eBay