I have a beige G3 and a B&W G3 which has a Yikes! board in it, but a G3 processor. I will probably keep both of them, and if one came along inexpensively, I would pick up an MDD, but I'm not actively seeking any of the others. If you have a QuickSilver, they're pretty similar to the Digital Audio, and that's just a hop/skip/jump (only one) from the Sawtooth and Gig-E anyway. It's a lot like the difference between, say, the Quadra 650 and the Centris 650, or those and the Quadra 800.

If/when I look for another PowerPC system, I'll probably be doing it for OS X 10.5 apps like Creative Suite 3/4 and Office 2004/2008 anyway, so I'm not sure I'd bother seeking OS 9 compatibility. With that in mind, I could go for the mini, or the 1.42GHz eMac, or an MDD PowerMac. (dual 1.42 would be ideal, but if it was cheap enough, I don't think I would say "no" to any configuration.)