The venerable #75 (large stockman, muskrat, moose) is one of my favorite frames from Case besides the Barlows. One of my main EDC knives is a 6375 large stockman (echoing a recommendation above) in CV. I love everything about that knife, from the long standard clip master to the beefy, broad sheepsfoot that can do so much more than a typical sheepsfoot on a small/medium stockman. I have two in amber bone that I got for under $50 each (though full retail may be slightly over that).
I'm also not seeing a sowbelly among your collection. My latest acquisition, shipping today hopefully, is a new Case Carhartt single-blade sowbelly with barnboard bone handles. Under $40 online, I imagine you can find it at a Case dealer within your stated range. I am sure I will be posting about it in the days to come as I have time to examine and carry it.
Of course, you could also toss in a few bucks extra and get a Case Barlow, assuming the dealer managed to keep some in stock. Everything's better with a Barlow! [emoji106]
Edit: Since I see you purchased some knives already, I figured I'd leave my recommendations here for others who might have a similar decision to make.