I had an iMac 233, with Game Wizard, which was great, but don't expect any of the alternative OS's to support it.
I would second what other's have said.... BeOS did start life on PPC, but they never supported G3 and newer Mac's...thats ancient history now.
Anyway Mac OS X is great, I wouldn't choose any other OS to run on that machine. You can either just run the latest software, like most mac folks, or you can play around with the shell, cause it really does have the unix underpinnings. It's a great OS, slick and customizable at the same time.
