Although as previously stated i do like using Powermac G4's as foot rests, i do also run morphos on mac hardware. I recently bought a nice Quicksilver 2002 - one previous owner, really nice and clean inside and out. As an added bonus it's equipped with a 2Ghz G4 7448.
Just for fun i've got it clocked at 2.13Ghz at the moment. Being able to use third party cpu upgrades in Powermac G4's remind me of the classic Amiga scene with all the different accelerators you can get.
I've owned a brand new Sam440ep with AmigaOS4.1 in the past but I much prefer my second hand mac mini G4 1.5Ghz running MorphOS. It's always nice to own new things but recycling is better for the enviroment ;-)