Why would you want to run Windows on a Mac when you can have Mac OSX?
Is it because you have never used Mac OSX before? I'm a mac owner too, have been for the last 6 months and at first i was a little scared of converting to a Mac user when I had been a Windows user ever since school when they were running Windows 3.1 on 386's.
After about 1 month of using Windows and Mac OSX now and then getting to grips with it, I am now 100% converted and am absolutely loving it and will never go back to Windows (unless of course they do something amazing), but at the moment, i believe about are about 2 years ahead of Windows technology wise.
If you want Windows on your Mac then go for a Mac with Leopard as it's easy to get Windows installed. There's always Tiger too on mac's which are pre-november 2007 where you need some free software off the apple website called Boot Camp.