What do you mean split the power? You simply plug an extra power cable into the card. At least that's how my 6600 worked. Yes, you plug it directly from the psu. I would recommend at least a 400-500w psu though, especially if he has...
It doesn't make any sense not to do the gig if he is being paid that much money, and you would be willing to lend him a laptop. Damn. This should be in the psychiatric help forum instead bud.
With BF2, even today, some people have problems playing it at even 1GB! 1.25-1.5 GB is optimum to get the best performance.
Games such as Planetside hog so much ram it isn't even funny, it requires a gig to play fluently and that was...
I believe Best Buy has one, I remember them offering some good warranties. I would recommend Best Buy over any of the other chains you mentioned. But, this is just me considering I had the best experiences from them computer wise....