Dude, get a laptop. Portability is great in college. Trust me.
As for games, you don't need them. Especially if you plan on getting into medical school.
If you must play games, your laptop will support plenty of them. Not the latest and greatest, but get a game system for that if you want to, like Playstation or whatever.
Think about it. Your computer will be portable. Take it to classes. Take it to other rooms. Take it to the library. Take it home when you head home for the weekend and still get work done. Take it on road trips and work in hotel rooms.
Believe me...once you switch over to a laptop for your primary platform, you won't ever go back.
I might be going out on a limb here, but if you can spare a few hundred more bucks (what you'd probably wind up spending on games, joystick, speakers, etc) you can get a Titanium 550 with DVD only for under two grand now.
It's a pretty solid platform that will last you a long time. And the display is great -- especially since you can attach an external monitor and double your desktop space. The ibook can't do that -- it can only "mirror" what's on the ibook screen. One of the reasons I upgraded mine to a Ti.
Don't worry about Titanium durability. All these people who are bitching about durability are probably just not taking care of it or being careful. I've had mine for six months, and I live at a boarding school where I teach. The thing goes -- EVERY DAY -- from my room, to my office, to my classroom. Sure it has nicks and scratches on it, but none of the serious problems people seem to worry about.
Well, that's my advice. Get a portable. You'll use the portability. And as for med school, well, forget the game issue kid.
PC