I think you should be thinking of more than the "game" it will run tbh.
First of all, the trick with "geting the most for your money" when buying a Mac vs PC is that you have to get the MAC soon after the new model is out. Mac prices don't really drop until the very end of life...while PC prices drop as component decrease and new models (even by other brands) come out after couple of months. So in this sense, you CAN get a much more powerful PC than the "equivalent MAC".
For college, if you're into something business oriented, or technology oriented, usually a PC is the way to go. SOME sciences use Mac's...but that's only because OSX is unixie...not because scientists are technophobes. lol Mac's are still geared toward artistic fields. I mean, you can get away with it in "neutral" majors like education, liberal arts, etc. You might want to ask a counselor of the major. And because there are "unwritten rules" like more firends can "give" you free Windows software, those fields which are sofware intensive favor PC's.
Now regarding gaming, with a Mac, you're likely to be missing out on all but the most popular titles...unless you Bootcamp it (but refer to first paragraph). You have less gaming peripheral options. You won't get DX10,11,12...or PhysX. These are primarily Windows technologies made for game design. If you're not too picky about specific titles, you can play a lot of Windows games on OnLive, but that's very small right now.
Don't be too afraind of Evil Windows. You're young and can adapt to technology real fast...although Windows is really for dummies compared to a long time ago. It comes with a free virus scanner today too I think, or you can dl AVG. But if you want to mess with it because Windows is a lot more powerful and flexible than OSX...then' you're on your own.

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Even slightly serious about playing games OP? Do yourself a favor and just put together a little gaming box.
Of course still get a Mac though, lol.
One thing for sure is that the latest and greatest settings, will barely run well on today's mid level desktop graphics cards. So if you wan't a taste of thisas these games release...then you'll have to go desktop PC.