The "Air Force Survival Knife", smaller version of the venerable KaBar, isn't a bad choice. It is the original compact, rugged, simple and inexpensive field knife. All those traits was why it was adopted by the Air Force.

It was a compromise and it isn't optimized for a lot of situations but its weaknesses are minor and they are usually easily worked around. Your never going to get the interest and acclaim of your fellow travelers but it is a solid choice and one you can depend on to give solid service when you need it.