I know some folks will swear by Macs for video, graphical and audio work, but frankly, the days of Macs having a leg up in those areas are long gone in my opinion. There are many programs out there that will allow you to do the same work on a PC at the same speed. Sure, the Mac has a few Mac-only programs, but the PC has that aspect to it as well, along with many quality programs that work just fine on both (Sonar, Adobe products, etc.). Plus, you can usually get a powerful PC for less than a similar-specs Mac, so that could give you some cash to use toward other things (software, components, etc.).
So yeah, I'd say unless you've got a hard on for some Mac-only program, get a PC and put the money you'd save toward something more useful than an Apple logo.