If all goes as I've planned, I'll be looking for a new (used) car in the next few months. Obviously, I'm looking for something that can be competitive in its class in autocross. I've had a good idea of what I want for a while, but thought I'd hit you guys with this question well in advance of my purchase. What car would you get provided these few conditions?

This will be my only car, driven daily.
Rear wheel drive.
$22K or less.
Prefer coupe, non-convertible.
Less than four years old.