Here are some options:
Grohmann #3 Boat knife, light, sturdy and large enough for most needs. 4in blade.
Frost's Mora, light, sharp and cheap, like just over $10. The sheath is junky though. Blade is 4in.
My first choice is a Stewart Marsh handmade bushcraft knife. Super sharp, heavy duty and a piece of art. Sheath is excellent also. The blade is about 4.5 in.
I own 4 Randall knives and they are beautiful, I see them a great military knives when you may need to use it as a weapon. The 5in models I have are still what I consider too large for fieldcraft/bushcraft.
I love my Stewart Marsh knife. PM me and I can send you his email, it you are interested. Cheers