I don't feel severly limited with what I can do on a Mac, but then again you just don't see PCs in my profession, so I really wouldn't know what I'm missing out on.
The defensive PCs guys posting here are right about the virus issue though. Those "evildoers" want the biggest hit possible so it makes no sense writing them for Macs. And Macs aren't immune to them by any stretch. I can remember that pesky "restart virus" from seven or eight years ago.
Burning CDs or DVDs can be accomplished with either platform, just choose the one you're more comfortable using. The only reason I recommend Macs is that these days they come with iMovie, iDVD, iPhoto and iTunes, all the software needed to rip and burn music, and edit movies and photos.
Kevziek, if you'd like to stay with the Mac OS a new machine might be the best choice. It's difficult and sometimes downright impossible to get support or repairs for older equipment. Yeah, us dedicated Mac guys have plenty of gripes about Apple and some of the third party developers especially in the world of graphic design.
In the summer of 2001 when the Apple Cubes were discontinued, I bought one on Ebay and have been having a great time editing video from my Tivo and burning DVDs of the movies I Frankenstein together.
I dumped a 1.2GHz card into it and bought a slightly larger custom enclosure for it which allows it to run faster and cooler. Hey, I can even run Maya Complete on the little square guy!
Stay Mac and remain cool!