What is so bad about Windows? It runs on Macs and all their brothers since years. Just use a boot menu. I like the versatility of Windows computers. The only program running crappy right now is iTunes. Really. It sucks. Can't playback a video without hanging. Maybe its the air sync of 3 devices? Dunno. It's not the load for sure. Only uses 32bit and one of 6 cores. Ram is there, too.
I definitely would have a Hackintosh but I use a Phenom II and that doesn't mix with the kernel. There is just one thing I cannot get on a Mac: Games I want. I can play WoT, the new Assassin's Creed coming out tomorrow, etc. Mac users can't. Believe me - if I would have the games I want on a Mac, I would not have bought my desktop powerhouse AMD 6core / Radeon HD 6790. And for the ones being afraid of viruses: Don't visit pr0n!