Asus, Toshiba & HP/Compaq make the best laptops as far as brands go.
I would avoid Sony, Dell & Acer, and any laptop with AMD/ATI hardware
Gaming on a laptop is fail
Quiet you, all the companies you just listed buy stock components, OEM them, and stick them in a case and sell them for absurd amounts in terms of "Gaming Laptops". It's only worth going with any of them for some sort of deal that smaller resellers cannot give you, rarely will you find these deals on high-grade gaming laptops.
If you want a media laptop/desktop replacement that can handle games, look into the brand Sager, a derivative of Clevo products.
If you're in the states check out XoticPC.com, otherwise shop around for Sager or just look for Clevo products. NotebookReview.com is also a good place to get pretty well informed on mobile hardware, if you are looking for the best deal, the best mobile computer you can get, do some research on the hardware.
Class M products are tricky piles of shit, so read up.