Firefighting
Hmm. A knife to be used in an outdoor context for general purpose stuff, but also to be available for use in extreme temperatures and around open flames.
Interesting. Never considered that requirement.
Well, knowing what fire will do to plastics, and having had a knife or two of my own do very poorly when exposed to temps above 350 degrees, I can recommend against anything with a plastic sheath or plastic (or rubber) handle.
I would think that bone or horn/antler material would do better, with bone to be preferred, or a well treated grade of wood. Wood will char on contact with flame or embers, but it won't melt. I have a kitchen knife that I still use, even though it has a char mark on its wooden handle from an encounter several years ago.
Also, I would think that a full-tang construction would be desirable. It's more robust and easier to fix -- even temporarily -- after handle damage.
So, I'm thinking something in a three-to-four inch blade, full tang, wood or bone handle, with a leather sheath. Oh, and either a guard or handle shape designed to keep fingers off the blade, given that you'll likely be wearing gloves when things get stupid, and your grip could be compromised.
Well, then, let me go see what I can find . . . be right back . . .
Oh, and while I'm doing that, what's your price ceiling?
You said "high quality," and I'm guessing the description I laid out above will lead me to a knife in the $100 to $200 range.