NES: The original Legend of Zelda (not sure how rare it is)
Sega Genesis: the original Double Dragon, Tin Head (which I'm assuming is rare because of how obscure it is)
N64: Conker's Bad Fur Day
Sega Dreamcast: the original Soul Calibur (I think it's rare, certainly sells for a lot)
Gamecube: The Zelda collection (came with the Gamecube in fact, I'm surprised its rare now)
And I have a rare console, the Sega Nomad.