If you are looking for a dark cherry larger than Black Cherry I highly suggest
http://tatianastomatobase.com/wiki/Kazachka
You can always go to the seed subforum here called wanted, and ask if anyone has this or that variety since usually someone here might have it .
If you are Ok with much larger dark ones , more like beefsteaks,many good ones have already been mentioned here.I opted to stick with your cherry theme, and yes,there's one I forgot and that's Black Striped Sweetheart, Tania doesn't list it, but it's a small cherry size oval ,not a heart,with green stripes, and oh so good.
Carolyn