In my opinion the only Amiga's are the A1000, A500/+, A600, A1200, A2000, A2500, A3000, A3000T, A4000, A4000T and CD32 and even though its not branded as such, the CDTV. (Did i miss any models?) Basically anything produced by Commodore and Escom/Amiga inc that has the Amiga chipset and runs Workbench/AmigaOS.
The Sam440, AmigaONE and rest of the over priced and under powered PPC rubbish is NOT and never will be considered as an Amiga in my opinion.
MorphOS is very Amiga like but they never called it AmigaOS or Workbench because it isn't and at least it runs on relatively cheap G4 PPC hardware like G4 Macs.