I've built my own computers before, but I don't really know what to expect for laptops since I never really used them.
I plan on using it for portable gaming, but I obviously can't expect it to run Crysis 2 or Witcher 2 on something like a super HD texture pack. Something that can play something like TF2 or something at max settings with a good frame rate.
The budget is $700-800.
I'd prefer it if I could buy it from MicroCenter, Newegg & Amazon.
I think you'd be happy with http://www.xoticpc.com/sager-np6110-clevo-w110er-p-4343.html. It's very, very capable for gaming and roughly within your price range. And far better in terms of quality than anything you could get from Microcenter, Newegg or Amazon.
-What is best in life? -To crush your enemies, see them driven before you, and to hear the lamentation of the women.