the 9800M GTX is currently the top of the line single GPU on the market. It equals around the 8800 GT for desktop computers.
I personally went with the 9700M GTS which performs very similarly to a 9600 GT and consumes alot less power than the 9800M GTX which means more gaming on the go.
I have a 9700M GTS with 2.0 gig proc P7350, 4 gigs DDR3 320 gig 5400.
All of the games Are MAX unless specified:
AVG frames 40 in Crysis warhead (med) @ 1440x900 resolution.
COD4 plays 60 fps @ 1440x900 resolution with 0x AA and 40 with 4x AA.
Devil May Cry 4 40 fps @ 1440x900 resolution 8x AA
Pure 40 fps @ 1440x900 resolution no AA option so I guess off
GRID 45 fps@ 1440x900 resolution 4xAA
these are just avgs I could see where the games top off the most:)