Although it looks like you're already taken care of, I had a CRKT KISS that I eventually became fed up with (didn't stay open when I used it), though I loved how well it worked to clip my keys to my pocket. I wanted something that would be similar, and it took a bit of work to find.
I just replaced it with a Buck 173 Mayo North Shore. I think that it was recently discontinued and discounted so it can be found around $50. At 3-1/8in it is a little longer than the KISS, but so far it works great and locks open better than my old knife. Cheers & goodluck.