I'm seeing only custom responses, so let me throw in something on the production front (well, former production, actually):
The NCT Bodyguard. Cool little 4" blade of 12C27 that is completely symmetrical and came in two versions, double-ground as a dagger or fully flat-ground as a drop-point. I like the latter. Also came in bead-blast, black coat, or mirror-polished. The handles have a grippy spider-web pattern and are removable to leave it a "skeleton" knife. The sheath is a nifty idea from the days before Kydex was common in production. It's a molded plastic that holds the knife tightly in any position (left or right, since the knife's symmetrical). Many have tried these, but this one really worked. It had a removable boot clip that let it be attached in a variety of positions and retailed around $50-$60, I think. Very neat knife, wish I'd picked one up. I put scales on several but never did get one of my own! They are still quite a few in circulation, though...
I don't consider this a "fighter," but I don't consider anything in this size class a fighter because I think fighters are for knife-vs-knife "duels" and virtually must be 9" or larger with substantial guards. I'd call these "hideout" knives. Just my opinion.
(Why else would a bear want a pocket?)