I recommend Asus ROG series as well. Bought one awhile back when 1.23 was around in old XIV just now updated to the top of line. Have no major complaints. They do not have the fancy color buttons and stuff of Alienware, but if they have equally as powerful components for alot less. And they are well made.

As for no laptop for gaming the new Asus ROG JZ with the 880M is pretty beastly... both in performance and price though. You can get a gaming laptop in my opinion but it will cost you a pretty penny to get up to an average gaming desktop's performance level. Nothing Mobil can compete with a decked out pc though.