I have a Sidewinder Force Feedback 2 joystick. Its great. I've used the standard one, the Sidewinder Force Feedback Pro, and the grip on the FF2 is much much nicer. The hat switch on the FF2 is also nicer. The FF2 is USB, where as the Pro one is game port i think.
I'd get the FF2. The pro version is quite a bit older, and many improvements have been incorperated into the FF2. Don't buy dixons etc, they'll only rob you. try
Technomatic at £50 approx, for example.