I think he said he was looking for a shorty. Isn't the BK10 three inches longer than the BK7 that he has, which is 7 inches already?
Funny, I have the BK7 and I just got a Nimravus Cub the other day! The Cub is an awesome little knife. Not terribly small, not too big either. The sheath mine came with has a web snap closure -- I'd prefer a nice snug kydex sheath instead, or one of the newer Benchmade sheaths with that little plastic thumb toggle.
I have the 440C plain blade (no black coating for me, thanks) and it's a beautiful knife with a simple and strong design. I'm now looking for a replacement sheath, though.
Another knife to consider for this purpose is the Spyderco Bill Moran Featherweight (VG-10 steel). That one arrived yesterday, just a few days after my Nimravus Cub did, and it's really nice. It's the sharpest knife I ever got right out of the box. The thing is literally like a razor. Unbelievable for a production knife! I'm thinking of buying a second one, actually, to keep pristine for the future. (Somehow there is a nasty couple of scratches on the left side of the blade that I don't know the cause of.) The Moran comes with a really cool Tek-Lok sheath that can be arranged for small-of-the-back, horizontal, vertical, inverted, or cross-draw carry. It's funny, the coincidence, because tonight I wore it to work in small-of-the-back mode -- the first time ever, and on only the second night I've owned the knife!
If you get either of those two, you will not be disappointed. The Nimravus Cub seems to be the one more geared toward hard use, so consider that before buying.
---Jeffrey