I feel the Case medium Stockman is one of the best values out there, and an all around great knife to carry. The only, tiny thing that doesn't make it perfect for me is that I have no need for the spey blade. But it doesn't really make the knife any bigger, so no big deal at all.
I personally do not like the full size standard trapper. Again, I have no use for the spey, and it does add girth to an already fairly large knife.
The Case 6207w mini trapper on the other hand is my favorite Case pattern. It is 3.5", and replaces the spey with a Wharncliffe. The GEC improved trapper is a better knife, but is a little larger, and more than twice the cost. Beautiful knife though.
GEC will be making its #66 Calf Roper sometime soon (guessing this summer). It is similar to the Case medium stockman, but a bit "beefier". This will also likely be over $100 per piece.
As others have expressed, if you want to go the inexpensive route, I'd recommend Rough Rider over Frost. I've had some of each, and Rough Rider is typically a better knife.
I apologise for the crappy photos, but I included the ones I have to compare.
Starting at top of the 1st photo is:
1. Case 6318 medium stockman
2. GEC #66 Calf Roper stockman
3. Rough Rider stockman
4. GEC #48 Improved Trapper
5. Case 6207w Mini Trapper
6. Case Peanut
