I have some pictures of my front suspended hard tail car on here under ad 1419318.
It was a non suspended car when I got it and was very rough to drive. After I had it front halved it smoothed it out about half. On the track it is really smooth but driving around the pits can be rough.
Davids car (hammertime) is a dual suspended and he says that is the only way to go. If I would have had the money, I would have had it done.
I recomend at least a swing arm and preferably dual suspended.