Here is my suggestion. Go to your local thrift shop. I'm serious. I went and got a microsoft racing wheel with pedals for 10 dollars. This baby.
http://www.tweak3d.net/reviews/micro...l/images/4.gif
Its used and it looks used, but it works perfect, I have played PTTM with it. 10 dollars vs 100. Think about it.
Of course if you absolutely must have gearshift, go ahead and spend a lot of money, but you can buy gearshift separately.