[Sarcasm]Buy a PC. Otherwise looking at this thread, there won't be many machines running an MS operating system soon. Do you really want your software managed by the iTunes App Store or coming via Software Updates?
It's becoming a MonApplely.
[/Sarcasm]
I'm beginning to wonder what else is happening in the computing world these days. I bought a TiBook when OSX was first released for my personal use. I wanted to get away from the personal computing mono-culture and back to thinking of computers as tools and creative outlets for problem solving.
I stayed with a "Mac for home use" and "Thinkpad for work" for years until ~18 months ago when I bought an Air. I wouldn't have done it if they'd given me something reasonably small. But the T61 I got threw me over the edge. I bought a 1st Gen MBA and haven't looked back.