For pure affordability a good used a AE 12L4 would be a decent choice. They can be had pretty cheap and would be a decent car to learn with for a while until you decide what you really need in a car. Run the old school front end with it and you'll be pretty close. Very consistent, cheap to fix, great car to grow and learn with.
-Tamiya TA05-R - Tamiya M05 - Summit Raceway Ft. Wayne, IN