Yes, a GVR4 is a mits, but you're thinking of the wrong car. Not a 3000gt, a Galant VR4. 4G63t powered with a curb weight of about 3k. Think old school EVO.
Pinecone: You're probably right in that the best investment I can make is in my own skill as a driver - that might also keep me from "exiting the track at an inappropriate place". Racing a car is more fun than any given mod anyhow.