Pegaus? Pegasos? I'm surprised you guys included PPCs.
Mine? A 1.25 Ghz eMac under MOS 2.5 (w/ a Powermac waiting for 2.6).
If PPC alternatives weren't available though, I'd go with a 1200 (but Amigas COST too much).
Niandias, don't worry about MorphOS users bugging you about your choice. Use whatever you want. Supporting AOS4 means another PPC user is added to the market. More users for either AOS4 or MOS is fine (software developers usually support both OS').
We both have to worry about the X86 camp (those that want X86 ports, AROS users, and the Linux fanatics). I'm surprised none of them have posted yet.