PSX would be great. There are many great strategy rpgs that would be very playable without needing to be fullspeed. The guys responsible for PSX4all are very, very talented. Just look at how their emu does on the Zaurus or Gizmondo. The GP2X was just too underpowered for it, and they still got some games running half-speed. With a bt controller on the N800, it would be heaven.