Folks, lets be rational. Neither OS4 or MOS can even utilize the full power of the 32bit G4 yet. As far as I know or have heard, there are no code op's for SIMD in *either* OS. Neither OS's are mature yet, and while utilizing a G5 would make certain app's run faster, the price simply cannot be justified yet.
My avatar is simply wishful thinking.
It's kind of like putting perfume on a pig: pointless.
Personally, I'm waiting for the A1 Lite. According to the OS4 roadmap, there won't be much of a reason to buy a G4 until OS4.2 (go hyperion! :-D ) , so I'll wait until then to invest a large chunk of change into an Amiga power system.