ATV and racing games for xbox 360?

I have both PGR 4 and Burnout Paradise. They are both good but very different. For me Burnout Paradise is one of my favorite games. It's a must for any 360 owner, in my opinion. PGR and Forza are more sim type racers. Forza 3 is newer and is supposed to be the racer on the market today. It's up to you but my vote is for Burnout.