If I were you, I would just save up for the Xbox 360. I am not sure if there are really going to be many more good games coming out for the Xbox. Most developers are now working on Xbox 360 games. But if you are going to be buying both or something, here are some good Xbox games:
HALO 2
Forza Motorsport
Tom Clancy's Splinter Cell Chaos Theory
Grand Theft Auto: San Andreas
and Burnout 3
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