Any of several Kershaws; which one purely a matter of whim, but often the composite JYD II. My Kershaws carry light and compact, deploy with one hand (left or right) and keep an edge that does anything I want it to with ease. However, I have pre-ordered the Ritter Grips in M-4 in both standard and mini. When they arrive, I will probably be so attached to them that I will sleep with them. (My wife is a very understanding woman.)