If you're going to get an A1 (as if you wouldn't!), then I'd suggest one of the two distros that currently are supported on the PPC: Debian or Yellow Dog. There is not much between them, there is plenty of support on the A1 developers' list, and plenty of help on the web.
SuSE used to have a PPC distro, but they've abandoned the PPC for now.
tony
