I have to say, the day I brought Windows into my studio (to run StudioPrint) was a tough one philosophically...But after 4+ years of running a clean box with no internet connection and only 3-4 non-OS apps, I have not had any hiccups or problems with the PC. It's ugly, both inside and out, but it gets the job done. My Macs and I, have had some difficult moments over the years but we always make up in the end
And don't hold your breath for a Mac version of StudioPrint...
When I saw Josh Lubbers at PMA he suggested that somewhere down the road there would be a Mac version of ColorBurst that includes multi-image page layout. That would really be worth checking out.