Depends on where you want to make your compromises and what you're willing to spend. The cars mentioned so far are used cars, based on your price range. You have a lot of options among new cars, as well; everything from an E46 M3 (which you can get under $50K but not by much) to a CL Type S (a steal at around $32K fully equipped, and soon to be available with six-speed) and probably a couple dozen other sporty luxury cars from Acura, Audi, Benz, Lexus, etc.