If you are interested in Playstation and GT4 as well, I'd recommend going with the Logitech Driving Force Pro. It is a Playstation wheel, but it plugs in via a USB port, therefore, you can plug it into a PC. Windows XP simply recognises it as a Driving Force, and lets you go from there. You can manually set turning distance and force feedback modes and most PC games have enough set up options to make sure the steering wheel is set up brilliantly. NFSU2 was a good example. In 180 degree mode it was as good as any other PC wheel I've ever used. PC games will eventually come out with 900 degree support and when that happens, Logitech will just market another wheel that is exactly the same as the DFP with different plastic on it. You'll already be a step ahead.
I don't know how much it's worth in America as I'm from Aus, but it is one of the more expensive wheels on the market. If you can make the stretch though, your dollars will be well spent.