Sounds like time for a road trip to me.
To me, these knives mentioned are kind of "weekend" knives. The kind I carry to keep in nice shape.
For a good work type knife I have a Boker 74 auto that was about 50 bucks, and I beat the tar out of it. Aluminum handles with these sort of finger grooves across them. The button needs a firm, and lengthy push to open so I don't worry about there being no safety. They come in all sorts of configurations. with different blade shapes, types, finishes...
Overall I'd call the Boker a work knife, and the others dress up knives but that's just me...
Heck within your budget you could score a Mikov, and a Boker.
WTB Kershaw 2120 MACHO Lockback Parts knife
I need a pile side scale. THX!