Only game for the pc thats out is what theey call "Dirt Factor"..But you have to have rfactor(which is the actuall game) to d/l it.Its the most realistic out there for lates and sprints.Oh rfactor is only available to buy online.
http://www.rfactor.net/ here is a video of the late model mod for it.
http://www.youtube.com/watch?v=cPV0tGPkZfE