Picking Laptops, which to choose

[darkthreat]

2 Questions:

1) how does ATI Mobility Radeon X1600 256MB PCI-E Video compare to
NVIDIA GeForce GO 7600 256MB PCI-Express X16 Video?

and

2) Would it be better to have a:
Intel® Core™ 2 Duo Mobile T7600 Dual-Core Processor @ 2.33GHz 667FSB 4MB L2 Cache EM64T
with 4GB (2x2GB) PC5300 DDR2-667 SODIMM Memory

or

Sckt775)Intel® Core™ 2 Duo X6800 Extreme Edition @ 2.93GHz 1066FSB 2x2MB L2 Cache EM64T
with 2GB (2x1GB) PC5300 DDR2-667 SODIMM Memory?

I ask because certain models with higher processor speeds offer less upgrades for mem, while those with lower offer up to 4 gb.