I would go with Grand Turismo. You will not find a better racing game. I been playing this game for a while, and it never seems to get old. You should definitely check it out.
hhgregg
Need for speed is pretty good. I haven't played a lot of racing games on Dreamcast so there may very well be cooler ones, but I had a lot of fun playing this game.
hhgregg
The best one that I have tried was Need for speed. It has pretty good graphics for an app, and has all the functions of the console game. You should check it out.
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I like Grand Turismo 5. It is the best racing game I have ever played. It is very reallistic, has great game play, customization, etc. You should get it, you would be hard pressed to find a better game.
hh gregg