If gaming is important to you, get a PS3. It plays blueray movies, access to your netflix account (unlike xbox live where you need a gold membership just to access your already paid account.)
I've had an xbox360, Wii, and now a PS3, and the PS3 is the single most useful entertainment system I've ever owned. I ended up getting two of them. One for downstairs and one for my room. I have Black Ops on the PS3 and it is absolutely amazing. I have a large LCD HDTV so it works well for me.
If you insist on a Mac and want to play games, bootcamp is your best bet, and so is an iMac 27" quad core. That would be a great new toy for Christmas. For portable gaming, get an iPad- I believe there are far more games for iOS than for OS X (which is really sad.)
There are a lot more of us "gamers" on Mac's these days, and we want more than overpriced hidden object games that look like early 90's adventure titles in which their sales seem to depend on the lack of games overall for OS X. (a tired old trend I hope Steam will help to phase out.)