I was a little bit disappointed by CMR3 as far as graphics go, but it's nevertheless a good rally game. I too thought Rallisport to have easy controls, so you better try CMR3 before buying it as I found it more difficult to control than RS.
I will buy Racing Evoluzione (Apex) over the next few weeks, but from what I read it should be a straightforward arcade experience with pretty graphics (and sometimes annoying AI :? ). Any new info about the bugs someone posted?
Burnout 2 is a nice, easy to control arcade racer (great graphics atleast on PS2) but it's still several months from release on XBOX. Burnout is IMO a totally different experience than the other racing games listed, so be sure to check if it fits your expectations of a racing game.
TOCA Pro Race Driver (I only played the PS2 version) has IMO good physics and OK controls. It seemed a bit rushed on PS2, so if they fixed various issues it could be a nice racing experience on XBOX.
Like with the other games be sure to try it before buying. (I have a hard time with the cutscenes and the story)
Wait for the first reviews of World Racing. Synetic has always produced pretty racers on PC so graphics should be good.
Before any of the games listed above I recommend a PS2 with GT3 and the GTForce wheel. If you're really into racing games and have the space for the wheel this combination is worth the money.
GT Concept is a nice addition but be sure to get A-spec too. This game is a true system seller.
I personally can't wait for the next GranTurismo.