Windows only has DRM for people stupid enough to actually pay for it
Seriously, if you're going to support something, support Linux. Linux and OSX can do everything Windows can except games, which is cool because anyone considering getting a Mac obviously doesn't play games anyway (except for the few who can be bothered tainting their precious white boxes with a Windows partition or really really like Quake 4).
Linux is usually free and infinitely upgradeable and modifiable and has more tech support than the internet has room for.
Although I will admit Macs do have an advantage over Linux if you're a composer, which is because most goddamn nonconformist beatniks use Macs. But I don't think Superkid is a composer, are you SK?
Linux also has that ****ing awesome theme thing which makes Aero and Mac's windows look like the NES.
EDIT: My point is, a PC you can upgrade up the kazoo and do whatever you like with, a Mac you can't. If you're thinking of getting a Mac and dual-booting with Windows, buy yourself a PC and use Linux and Windows. You can even get Mac OS themes for Linux
, so it's just like you're using the goddamn thing. Except you didn't have to pay for that shit and you can upgrade it and modify it however you like.