I am of the opinion that you are going to want at least two or more knives. Knives have to serve purpose-specific needs. You need something larger for hacking, chopping, fighting, construction, etc., and the K-Bar USMC mentioned above serves that purpose admirably. That's my choice, too and I have one in my bag. Then, you will need something smaller for the more precision tasks like carving, splinter-removal, cutting vegetables and meat, etc. For this, you will want something like the Buck 110, which I also have in my BOB.
But, here's a cautionary note on the Buck knives--they are no longer made exclusively in the good old US of A. Walmart made a devil's deal with Buck to purchase x-number of Buck folding hunters IF Buck would reduce the price to something obscenely low. Greed got the better of Buck, they said "yes" and they went to China for production. You can still get a Buck 110 made in the US, just not at Walmart. Look on the hilt of the blade. If it says China, it's junk.
I think you will want to carry one more knife with you for the thousands of small tasks knives are needed for, and my choice is a Case Texas Toothpick in vanadium chrome steel. The blade will stain and even rust if neglected, but it takes and holds an incredible edge. The Toothpick comes in two sizes, small and large. I carry the small Case but I am looking for a large. They can be found in surgical stainless, and I may have to settle for that.
Finally, you will need a good, compact sharpening system. I went with the Smith's Precision Sharpening Kit for around $30. It has a guide that ensures you put on a correctly angled edge on your blades. I need all the help I can get, so that works for me.
Hope this helps you refine your search,
Crusader