I think I was probably in a similar boat last year when I got my first Mac. If you're better than the average windows user, as I suspect you are, then I'd guess you're not going to be that impressed with OSX. It seems to me that a) most mac people haven't really used windows since at least Win98 and compare that experience to OSX b) if you're not one of those people who is constantly bombarded by viruses and junkware, then the huge advantages of OSX aren't really there. Also, get ready to curse every time you hit ctrl+c instead of command+c and don't get anything copied to the clipboard! I hate that.
However, once you use expose and get your feet wet with quicksilver, it's hard to go back.
If you can get parallels, definitely go that route rather than dual booting/boot camping. Parallels is just awesome.