@danwood - Well said, I have an old G4 tower that had MorphOS on it. Tried it many years ago. Not sure if I liked it or not. Looking at an Apple machine might have been it.
Was going to put it in another case, but now the G5 is supported I may look at that. A mac mini is a nice size, always wanted a cube though. A shame MorphOS doesn't support it.
Well I've used Macs for years so I'm not anti-Apple, that's never bothered me - it's just a cheap way of getting a PPC motherboard really that's got professional build quality.
I bought an A1XE years ago and after living with the DMA bugs, the USB problems, the Articia chipset design flaws, non-working onboard sound, flat battery stopping boot, spending over $200 trying to get working RAM modules that were compatible and other many other oddities, random lockups, boot failures etc. I learned my lesson and won't buy another obscure low-production numbers board like that again, moving to a PPC Mini with a more professional mass-market, thoroughly tested design and no quirky bugs was very refreshing actually. I don't even notice it's a Mac, the machine sits under my desk so I can't see it, in my mind when I'm using it I just go into a fantasy work that it's 1999 and I'm using a Boxer or something

I didn't realise the 64MB Mini was that rare, mine is a 64MB version, I have heard that's the one to get though for best experience. You might be better off with Powermac G4 or G5 though as you can just install your own GFX card. A G5 Mac will also give you the fastest "NG Amiga" experience too, I quite like their design, considering one myself, got a great workstation look.