Should I trade my 2003 Chevrolet Cavalier for a 1993 Honda Prelude that is kind of a show car?

Keep your Cavalier, it is a way better car than any honda from 1993. As long as the Cavalier is clean mechanically, you would be way ahead in keeping it. Besides, you know what is wrong with your car. You don't know exactly what is wrong with the "new" used car.