U is for ubitquitous
and yeah the gp2x platform is a good one imo.
Amiga support is still not perfect but is being worked on all the time and it is all open sourced so everyone gets to play

(It has Sega Megadrive/Genesis emulation that is pretty close to 100% amongst others)
I think it might be a while before everything that runs on a A500 will run on the GP2X - 2x 200Mhz ARM9 cores aren't super fast when it comes to emulation of course.