SSD doesn't make a difference in terms of game's performance,it only reduces load times.
I personally recommend Crucial M4 SSDs because of their reliability
I will have to disagree here. I just got a new Kingston HyperX SSD and I saw a pretty noticeable FPS increase in BF3, one of the main games I play. Sure it wasn't 15 fps but it was very much noticeable.
Online racing? Do you mean playing a game on the Internet? If the answer is yes, then a solid state drive will not make any difference. You are totally at the mercy of your Internet Service Provider and the online games' web host.