well, if your using linux, definitely get an nvidia card. you will save yourself tons of hassle installing nvidia drivers over ati drivers. if using ubuntu, just type in "sudo apt-get install nvidia-glx" into a command prompt and your good to go. or you can use synaptics! glad you like linux!
im with you on power savings with the processor. i would prefer a mobile processor myself because without long battery life, a laptop is basically just a desktop. all im saying is dual core > single core. but a mobile proc is a given
when i was in baghdad this fool in my platoon brought over a sager with every god damn power sucking amenity available. his batt only lasted an hour and 5 minutes. one day he fucked me over, so i fucked him over right back by using all the available power plugs in the noc. he was begging for an outlet.