let me just give you the skinny on how i feel about the whole mac v pc debate...(this is all my opinion and what i would do/have done)
i am into audio/video production...writing/recording songs, fiming/editing videos, that sort of a thing. i have used both platforms for both scenarios and i hate editing anything on pc's. period. for me, there are a lot more compatible interfaces/third party plugins/blah blah that i think run smoother on macs so in the auido/video world...i will never use a pc again.
now im also an engineering major so i use software like autocad, solid works, matlab, mathcad, that sorta stuff. all of that is made for the pc platform and those are industry standard softwares. to run those big programs on a mac is a complete pain in the ass...so engineering applications...i would go with a pc.
those being said, i guarantee you will spend 96.69% of your time just chillin on your computer, this is where i prefer mac over pc and windows yet again. i have never had an sorts of technical problems with the luxuries everyone expects from their computers. my two roommates, who both have lenovo thinkpads have problems all the time. one runs windows, the other linux, and the one running windows has the slowest computer ive ever seen, right behind my other buddies hp piece of shit. i also like how macs feel, they feel solid and like they are one piece when you pick it up. not like the think pads where they are bulky and feel like the top might fall off whenever. i also like the operating system better as well. just seems less clunky to me for what i do and use it for. (except lion, thats effin trash)
all of that being said, i am a mac man and will be for a very long time. now everyone will say "oh cant game on mac, oh cant have multi-touch trackpad on pc, oh yes you can this oh no you can't that" and there are some windows computers coming out nowadays that mimic the style and features of macs because everyone likes them. so hope that helps a little in your decision.