Very good crop of suggestions.I'd second a GEC No.25 single bolster Jack. It's thick, stubby and you get a good grip on the knife plus the Swedged Clip blade is a good thin slice.Looks bonny in Stag. Myself, I steer clear from Buffalo,it CAN shrink back from the bolsters (I have a couple of knives like this) so I prefer bone or stag. Schatt&Morgan Harness Jack is I think within dimensions. Saddlehorn is a pattern you might like to try as well. As for CASE, 12 out of 12 is not a bad ratio in my experience,pick up something in their fast disappearing Bonestag 6.5 and you won't regret that, their small Texas Jack is a totally fine authentic knife too:thumbup: So you could still consider them.
Once you've stocked up on a few Americans don't forget Old World knives either.Böker make a surprisingly decent slip-joint,think about their Copperhead in Grand Canyon Bone and carbon, some of the better jigging around. Nice hefty knife too.Recently got a Böker apaloosa bone stockman from a fellow forumite,some decent bone on that as well, good luck!