Neo Geo Pocket
There's no doubt about it: The Neo·Geo Pocket just plain rules. It has fulfilled my every expectations. At only 120 mm wide, it's smaller than a SNES cartridge, it has a battery life of 20 hours, and has a sprite handling ability comparable to that of the Mega Drive. The animation in King of Fighters R-1 just has to be seen to be believed.
The Neo Geo Pocket Color is here, with longer battery life (using AAs instead of AAAs), a larger screen, and 146 colours from a pallate of 4096. But the black and white Neo·Geo in your pocket still lives on, as SNK have stated that all future colour games will work on the original system.
Buy, Sell, and Trade Neo Geo Pocket Systems and Games