Your links don't work, but that's a function of Best Buy. They never work. Anyway, I think you are looking at the Asus G51 and the G73, right?
The Asus G73 in the second link is about as good as it gets. The HD 5870 is currently the fastest mobile graphics card, plus you get DX 11 which the G51 in the 1st link doesn't have. My vote goes for the G73.