Wait for Pat to chime in here, I can't remember his name for the life of me, but there is a guy that runs a Fox in Rally America in the RWD class really successfully. Let me see if I can find his name. I may be butchering this info, but Pat (drinkitdown) knows who it is....
Mark Utecht
How about a FB RX7? Don't know if you want to mess with a Rotary as a fun car. It's not fun when your cheap car needs fixed all the time.
Or a 944 would be fun if parts weren't so damn expensive. We have a 944 at the shop with low compression in 2 cylinders that can be had for next to nothing.