I use a PC, I thought of the switch to mac a while ago, but chose PC, I was going for a new laptop, with a PC you get more choice especially in the graphics department, which maya can be a bit pickey with, also a lot of the programms that I may/may not use seem to be windows only (at the mo) and I couldent see any advantage of a dual boot system... seemed to me like buying an automatic car with a manual system and never using the auto box, and paying extra for it too.
end ofthe day though its up to you, I went with the Dell XPS M1710. which I was comapring to the Mac Book Pro, as its a simliar price, but has a better screen res, better graphics, same processor's, RAM options (although the XPS can go to 4 Gig, where the mac Maxes out at 2 gig). Dosent look as pretty as the mac though!
"No pressure, no diamonds" Thomas Carlyle