For PC?
Cheapest if Logitech Wingman Formula Force GP. Also works as a
Logicool GT Force with PS2. Abt 150 bucks.
If you really want good, try the higher end Momo Logitech or the
Ferrari F1 Thrustmasters wheels. Abt 300 bucks for the kit.
If you want the best for PC, go to TecDrome, and ask Mr Woo for the
Act Labs Force RS, with manual stick RS Shifter option with the Act
Labs Performance Pedals bundle. THAT is the ultimate PC wheel
setup.
If you are using the PS2, try the Logicool GT Force Pro, with
sequential shifter and 900 degrees turning. Abt 300 bucks.