I am on a PC that I built.. I enjoy building my PCs(I have a couple). But I think I might buy a Mac Pro as my next 'major computer investment' mainly because I plan to get an iPhone, I have an iPod and I would like to get into editing photos and maybe video as a side hobby(I used to work at a photography studio and want to get back into my photography). I never liked Macs before. As I play with them and from how I have seen my friend incorporate Macs into his company I am more and more impressed and willing to be a computer hippie .