A little suggestion for you, MacMini, it is little and it has all, with an Efika you must buy graphic card, hard disk and case, and the 400 Mhz are few HZs to move games with MorphOS and the size is very similar.
I know, Efika is practically useless
. For MorphOS daily use I have Pegasos 2 (overclocked), wich is probably faster then MacMini in most tasks. And if I want some games to run faster, I use A1X100 or Powermac G5.
Efika will be for joy and some testing.
AmigaOS3: Amiga 1200
AmigaOS4: Micro A1-C, AmigaOne XE, Pegasos II, Sam440ep, Sam440ep-flex, AmigaOneX1000
MorphOS: Efika 5200b, Pegasos I, Pegasos II, Powerbook G4, Mac Mini, iMac G5, Powermac G5 Quad