theres not much in it, i say, get an iMac; its cheaper, it has a bigger hard drive (more games) and an amazing screen; i just upgraded from a MBP to a 20" iMac, and gaming is really amazing (and thats with just 1gb of ram)
Ok.. wha? Crysis? iMac?! Really? That's awesome. I was excited enough to get a n iMac just for World of Warcraft, but this is a bonus. Next year can't come soon enough!! 😀
I don't think the display size itself really matters, does it? I could run 800x600 on a 17" screen and a 42" screen and they'd both be the same. Now at 1280x1024 and higher, where your pushing more pixels on the screen, then I can see the need for more processing power / memory.