My bucket list (off the top of my head):
Pre 8 bit: Discs of Tron (Environmental cabinet), E.T. (2600 just to see how bad it is)
8Bit: Ducktales 2, Star Tropics 2
16 Bit: Illusion of Gaia, Chrono Trigger, Final Fantasy III (US Name whatever that is in Japan), Secret of Mana, Orge Battle, Any Sonic game (never played one on a Genesis)
32/64: Mario Party 1 and 2, Conker's Bad Fur Day, Mario Tennis, Final Fantasy 7, Prince of Persia
Gamecube era: Pikmin 1 and 2, Dk Jungle Beat, Luigi's Mansion, Metroid Prime, KOTOR
Modern: GTA 4, WWE All Stars, Batman Arkham (both), Super Meat Boy, Scarface (Wii)
Handheld other: All handheld Zelda games, the CDi Zelda games, Final Fantasy Tactics, Radiant Historia.
I actually own a few of these games, I just never have the time to sit down and play them.