I think the Pandora is going to be a fantastic portable Amiga emulator. There is no other device out there with a usable keyboard and good gaming controls in such a truly portable size.
I really don't think scaling will be an issue on a screen of this size. I'd rather scale at 800x480 than to any other device's lower resolution.
But then maybe I'm biased... I'm posting this from my Pandora now!