What's the rarest videogame(s)/console(s) you own

[Oblivion86]

Original Mega Man X-X4
Chrono Trigger
Panzer Dragoon Saga - gonna sell this soon (value is over $400 atm)
Suikoden
Asure Dreams
FF7
FF8
FF9

I have more, but I can't think of them at the moment.

Edit: a few more

 Ninja Gaiden Trilogy, Syndicate, Earthbound