Which Racing game for Xbox Should I buy?

[SHADOW]

I LOVE Burnout revenge. The car combat is awesome! I went to an arcade last week and played this great game. There are 6 booths, in a row, and you race on a track with each other. When you ram someone against the side hard enough, their car flips over and they slow down and lose valuable time. I love Car combat games like that and like Burnout revenge. I want a game that is a decent car combat game (like burnout) that has 4 player splitscreen and works on 360 (Can be normal Xbox or 360 game). I have looked at Rallisport Challenge (The first one) and Flatout. Which is best and why? What are the different racing modes (single player and splitscreen)? How is the AI? What happens when you crash? Can you cause someone else to crash, or is the game like one of those games where ramming is worthless? How is the combat? Can someone show me a video of each of these games having a crash? Thank you.
BTW, DONT suggest any new games unless they work on the 360 and are FOUR PLAYER splitscreen.