Grocery getter 03 Audi rs6
Let me throw a curve ball at you. SR20DET in a Datsun 510. 6 speed trans, turbo 4 cylinder, lightweight and independent rear.
Without a doubt a Miata the early generation (na), put a 1.8L in it and a small quick spooling turbo. Gut it, cage it, suspension it, with some lightweight 14" wheels and sticky tires and it'd be ready. Then deposit the remaining 7-8k dollars and go rape and pillage with it. Miata is always the answer for a reason, for those who have never got to own one or drive one, you need to. They are incredible cars!
New Edge V6/roller/whatever with a clean body. Strip, cage, race seats, Griggs setup, forged 4.6, used blower setup, wide wheels, built 8.8. Have fun, hurt feelings.