McClaren on 03 October 2009
The only thing that is a real system seller in your list for the 360 is Natal for reasons that everyone else has mentioned. The system sellers for PS3 in your list are Gran Turismo 5, God of War 3, and maybe Agent, Heavy Rain, and The Last Guardian. These are system sellers because they are either new IP's or first of series on PS3.
P.S.- Reach is a maybe as a system seller if it really is something fresh and new.
