+1 on CM's stuff ... good stuff from a good guy.
That said, in production it's hard to beat the utility to price ratio of Becker Knives; 1095 and very ergonomic handles - sheaths that, while not great, fit your parameters.
For your budget I would get three knives - that's right, three!
The BK-7, a BK-16 and a BK-11 or 14.
The BK-7 was designed as a military knife, is a good size, not terribly heavy and 1095 is easily sharpened and a rugged steel for field use. Did i mention the comfy handles?
The BK-16 is smaller and lighter but very capable; again 1095.
The BK-11 (or 14 if you prefer) can be worn around the neck or up high on your kit depending on preference. The 14 is preferred by some because with the addition of handle slabs is a comfortable knife while many like the wire breaker, hot pot handle lifter of the BK-11 which, I have heard, can also be used for opening beer bottles. Again, made of the beloved 1095.
With careful shopping you could have all three for $250+/- and always have the right sized knife on you.