Hi Mate,
if you just tinkering around with cars at home, and maybe a few hours at a local track then is doesnt matter what you buy, but if you are into racing on a regular basis then you need to really try as many controllers as possible in your price range.
I know some guys who have got 5 or more different controllers, and they still not happy. try as many as you can, and you will know the right one in minutes. some just 'feel' right.