This is an easy question...Every race setting you would want (although the exponential is apparently bugged, but there is a documented mod to fix that), and receivers are 7 bucks for your bashers. I've seen loads of these under the Ansmann brand, and they are outstading. Not just outstanding for the money, but very good radios too. A little battery hungry maybe.
http://www.hobbypartz.com/79p-gt3b-carradio-lcd.html