Buying a New Laptop Advice?

My second HP laptop has died prematurely on me, so I need to find a new one. I'm a high school student and my Computer Science course (which I start in 2 weeks) requires a decent computer. Not only do I need a laptop for work though, I would like a laptop that can handle gaming well enough to tie me over until summer when I get my desktop. Being a student, I would like to find a computer that can fulfill my needs for under $550. Future Shop currently has a Lenovo G50 (1TB HDD / 8GB RAM / AMD A6-6310) on sale for $430, I don't know if that's worth it or not.

Added (1). The most demanding game I plan to put my new computer through is Team Fortress 2, which my Pavilion dv6 managed fairly well.

I would recommend the Lenovo G50, Toshiba Satellite C55-B5272 or C55-B5200, or the Dell Inspiron 15 3000. Lenovo is typically less expensive. Most laptops these days can play TF2.