There are list of desktops hardware you need or certain model laptops for it to be flawless working.
The issue is not hadware anymore, Apple does not want users to be able to do this and they have done well at stopping it, the last stable version of OSX to go on PC is 10.5 (please correct if wrong) but with Lion coming out, in the next year or two there will be a lot of new software that will not supprt 10.5 which means yay! You have OSX on your computer but not able to use anything new.
I say just stick with Windows and enjoy your own intergration of products Like Windows with Windows Mobile 7, Xbox 360 and Zune that gives you the same safe ease of use as OSX for end users who don't want more then internet, music, games and basic video/photo editing capabilities.