I've got a GB Color and a GBA. I of course would like to get an SP, but there are quite a number of games I want, along with a player before I would pick up an SP. I just don't find it all that comfortable, but I do however like the stock backlight. But I like my Neo Pocket Color best of all, Capcom vs SNK, no other words said.
My handheld collection includes GBC, GBA, Atari Lynx, Game Gear, Game.COM, Neo Geo Pocket color