I actually quite like Luna and prefer it to the other Windows XP themes. I would normally choose the Classic one though. Although at the moment I am currently using Windows 2000 and therefore don;t have any choice.

But anyway, yeah, the Mac thing is growing on me a little bit, but I do prefer PCs. Maybe it's a familiarity thing as I've used windows based PCs for so long now.
Probably. I'm not usually that bothered which system I use. I like both, probably because I grew up using three different systems so am very familier with all three (Macintosh, Amiga, Windows).