I switched my laptop in the summer to a black macbook (from PC) and it's been awesome. It's extremely nice not to run spyware removal programs every minute. lol
I do have Windows installed on my Mac for times when I may need to view sites in Explorer or if I have to ever open any Windows only programs/files. You can just open "Windows XP" with one click in it's own window...best of both worlds IMO.
