I wish they'd get a Jaguar emulator onto the Go, with that number pad it'd be perfect for it. And those things are easy to put ROMs onto, so that would be even better.
I haven't picked up the regular Gamestation yet, I was waiting for the 7800+ to get released. The thing is, I've seen the Gamestation on Amazon for $60, waiting worked out for me. I will at some point get one of those too.