I have a couple of the CRKT Sting knifes.. these have a quick release Zytel sheath, are made from solid 1050 Carbon Steel. They are razor sharp and indestructible... and I rarely use them unless I am out hiking etc.

My everyday carry? A leatherman Wingman. Sharp knife, great pliers and a basic phillips and straight screwdriver along with a few other goodies. I use this thing practically every day, and it's one thing I would seriously make a special trip out to Bass-Pro to replace if I ever lost it.

Ka-bar makes a very good knife, but I would take a look at the CRKT family of knives. Also, as a pocket knife I also like the Tanto Flash II series of knives by SOG. I don't own one (yet), but I'm going to pick one up sometime this year.