If you are in limbo, go with the PS3. The reason is that PS3 includes the Blu Ray Player. Wher. eas xbox supported HD DVD which is now obsolete
I have both, and the gaming on both are incredible.
One con against the Xbox is that the fan is incredibly loud.
System:
PS3
Xbox 360 Pro
HD-DVD player
Apple TV
HDMI switch to connect all HDMI sources to Panasonic Viera LCD