Basically I have a whole lot of Game Gear stuff. White one, yellow, red, two shades of blue, Magic Rayearth, and Coca-Cola. Buying all that cost me a small fortune. I have all the Sonic related Game Gear games, shining Force Gaiden, Lunar, the two Phantasy Star games, Gunstar Heroes, Last Bible, Royal Stone, and a whole lot more.
As far as Mega Drive stuff goes, I have a Multi-Mega unit, Mega CD II, 32x module, two tank controlers. For games I have all the Sonic games, Snatcher, Knuckles Chaotix, Kolibri, Night Trap for 32X and a heap of others games. That is about it.