I'm not interested in playing computer games, I *am* interested
in a lot of Unix software, as well as producing video and print
content with closely-controlled and consistent color management.

PCs don't cut it *for those uses*, the Mac does.

PC is far better for those uses. PC has just as good if not better
controlled and consistent color management. Remember this isn't the 80's any
more. The PC has pasted the Mac in print and graphics. In fact I use
PhotoShop for my photography to create beautiful prints for sell, photo
contest and to hang on my wall. I use InDesign on a PC at work and I am very
strict with color management.
You want unix. With a PC you have freedom. You can dual boot with Linux or
run cygin right in Windows.
Oh you want video editing, well you can do that better with the PC. Sure
there isn't final cut pro but that is crap. There is Premier, Avid and 5
times more choices then Mac.

If one even considers a Mac then they are an idiot. PC is where it is at.