I have a Macs since about 9 months and it made me realy dislike every second I have to spend on a Windows computer.
I love Aperture and the usability, the effectiveness of OSX and that I can shut it down by closing the screen 100x without having one problem when opening it and restarting OSX in 3 Seconds.
I know they are not cheap but man, If you count a cent for every second waiting and frustration you have windows, it's pretty cheap!