If you're going to be travelling and lugging it around, stop and think for a moment: lightweight is your prime concern, and I don't care if you're Hulk Hogan.
Also, my general outtake on these things is that laptops are great for work, desktops are great for games. Yeah, you can get laptops that work well for games, but what's the point? You have so many upgrade limitations with laptops (upgrades being the #1 thing keeping so many gaming rigs current) that it's simply a waste of money.
For work, however, don't be afraid to get a less powerful laptop than you might otherwise - all systems sold today can handle pretty much anything non-gaming and non-3D animation thrown at them, with power to spare. Heck, my P3-600 can even handle 3D animations and rendering, it's just not extremely fast at it. So especaially for writing papers, researching stuff online, etc - go for portability over speed all the way.
And you can upgrade a desktop for around $600 USD to get a pretty good gaming rig, no problem.