Pick up a last camera to end collecting?

There are many topics here about picking up their first camera, and so I would like to ask from the other side : Which camera would you prefer to be the last camera that would put a full-stop to your collection?

For some smaller collections like Canon, I start with Canon F-1(old), A-1, New F-1, Canon 7, Canoflex RP, and I put an end after receiving my Canon EOS-1v film body. I won't buy anymore for canon, until it is so unique that I must to have .