I agree with melott (and it is only my opinion - well and his) :-)
Melott is quite right that it is the Amiga user AROS is (primarily) intended for...
68k support would be a good stepstone to get people to migrate - once there then x86 specific code can be developed further
it doesn't have to be amithlon, but compatibility never harmed any software
btw - Great job Matt and the others, keep it up.... I wish I could write code! :-(