No such thing as a cheap gaming laptop. Laptop technology is more expensive and less powerful because you're paying for portability. Even the huge "desktop replacements" don't have th power of a desktop, despite much higher pricetags. If you want You can get cheap gaming from a desktop, and you can get a cheap laptop that won't game, but you can't have your cake and eat it too.
I'd advise you to wait. No laptop is future-proof enough to last 6 years. My advice is to wait to buy a laptop until you know where you will go to school. Many schools require specific hardware or software for network compatibility.
In many graduate programs and law schools, laptops are now used for typing exams. If your laptop is incompatible with the software they're using 2 years from now, it will be all but useless to you.
Many universities now sell computers at a reduced rate through a group-buying arrangement, and they will sell you a computer configured for compatibility with the school's networks, and supported by the school's techies. There are definite advantages to these options, and you should certainly wait to see what you will need before you buy a laptop.
Second, a Sager isn't a great campus computer. I looked at the things, and they're great for gaming, graphics and presentations, but they don't meet student needs. Your laptop is something you will have to carry everyday, and it's something you'll want to use in settings where AC power may not be an option.
Regardless of what people here will say, weight is important. I didn't feel like 9 pounds was a lot to carry, but when I saw a 9 pound laptop, I quickly realized that it wasn't something I wanted to lug around.
I've just finished shopping around for a laptop for law school. I bought a Dell Inspiron 600m. With a 64 MB Radeon 9000, it's powerful enough to run games. At 5.3 pounds is light enough to carry around. And with nearly 4 hours of battery time, it should make it through my classes on a charge. It was also cheap enough that I don't have to cling to it after it becomes hopelessly obsolete. I liked the Latitude D800 as well, but this was much smaller and much cheaper.
I haven't pushed this thing with any high-end FPS games yet, but Warcraft 3 and Rise of Nations run at high resolutions with all the options turned to the maximum and maintain a high framerate, even in chaotic multiplayer battles. I'm quite pleased with it.