So I say, leave windows or osx for your music and video production needs, and leave your amiga for everything else.
+1
I have the same conundrum. Maya (and Max, unfortunately) for 3D work, After Effects and Photoshop/Painter for post production and Reason with Cubase for Sound. Sucks, but that's life. I hardly ever boot to my Amithlon drive now. Will be even less, when I finish building my new AM3+ rig.....