I was researching this stuff for a friend once, and decided myself, the next time I get a computer, it's gonna be a MAC.
Pretty much anything you can do on Windows you can do with a MAC, only faster. You can even run windows XP if you prefer that interface.
I was talking it over with a family friend who teaches Windows and PC stuff at a local college. He was a die hard Microsoft fan. Then his daughter got herself a Mac. He played around with it, and after a few days of browsing and feeling it out, he said he will never use Microsoft computers again, except for work. He even bought himself an iBook to bring to work with him, so he can use that between classes.
You will probably be great either way, because you are used to PC's that would be an advantage, but the loveliness of the Mac would be great too.
Sidenote: My friend ended up getting herself a Mac, and she considered it her best decision ever.
If only I could get a mac now...