If you go that route purchase a new(er) Mac that has Intel chips as its CPU(s): that way you could install either Apple's Boot Camp, or--better still--purchase a software title called Parallels, and install Windows XP on your Apple Computer. Older Macs like my 1.42 GHz G4 Mac-mini have PowerPC chips for CPU(s), so neither Apple's Boot Camp nor the 3rd party Parallels software run on them.
Also, you might want to wait a few months before getting a new Mac because OS X 10.5 a.k.a. "Leopard" will be released soon. The current Mac OS X is 10.4 "Tiger". If you buy a Mac now, it will only have Tiger on it; upgrading to Leopard a few months from now will cost you over $100.
Hope this helps.
--Two Shoes
Please notice my first 8 words in paragraph #2.