What are you going to be playing Forza Motorsport 4 with? Xbox 360 game pad? Psssh. I'm kidding. That's what I use, too. But there's a few other really nice controller options for this racer that you use, and the Fanatech CSR wheel and accompanying gear are probably the nicest of them. The wheel itself is now open for pre-order.
Fanatec has worked with Microsoft and Turn 10 to make the extreme high end option for racing controllers. If you're super serious about racing and what the full set-up, you'll need to plunk down some serious cash. The Forza Motorsport CSR Wheel is $249.95, the CSR Elite Pedal Set is another $149.95, and the CSR Shifter Set tacks on another $59.95. That's about $460 in all.
What do you get for that cash? A Forza-branded three-motor force feedback wheel with paddle shifters, an LED display that shows turn angle, and multiple settings for drift modes. The pedal set is made of aluminum, and uses Load Cell tech to simulate the feel of braking in a real car. Finally, the metal shifter is a 6-speed, H-pattern affair that can be mounted on either side of the wheel.
I'm going to give this wheel a spin soon, and I'll let you know what I think of it.