+1 f1 favours ati cards greatly. if your monitor refresh rate is greater than 60fps you may notice the difference. 60fps is perfect for racing sims imo. a gtx560 is not much of an upgrade imo. aim for a 6950 or 6970 or if you can crossfire, get another 5850.
Thanks for the best answer but I agree with this If you can find a cheap 5850 and have a CF Mobo Go with this,