ARM isn't a bad architecture, but it isn't my first choice either ( MIPS For LIFE / IRIX is forever! ) I have myself a G5 Quad though with an X1900/512MB inside which is much faster than any of my MIPS boxen. Hoping MorphOS will support it and have a 64-bit kernel eventually.
So long as it isn't on the horrid 8080-derived architecture that Intel and AMD push ( And I want one for convenience, ain't I a hypocrite? )
At Home:
Amiga 3000D 68030@25MHz 16MB FAST / 2MB CHIP
Power Mac G5 Quad PowerPC 970x4@2.5 GHz 13GB
SGI Fuel MIPS R14000@600MHz 4GB
SGI Octane MIPS R12000@300MHz 1.5GB
SPARCStation 20 SPARC II@75MHz 160MB
Sun Ultra 5 UltraSPARC@270MHz