The Mac Mini is a nice system. Compact, fairly powerful. But if you're actually considering buying a license, a G4 Powermac is a better platform for MorphOS.
The 1.42Mhz processor in an MDD Powermac isn't much better then a Mac Mini's processor, but the PCI/AGP expansion slots allow for a lot more upgrading.
And the Powermacs are available at a low cost.
