A small, plastic handled Schrade lock-back when I'm working. A cheap, stainless, liner lock pretty much the rest of the time. Like I said, it's cheap and an import, but it holds one hell of an edge.

I carried a buck Stockman for quite a while until I broke the tip off the main blade. I just haven't sent it in yet to be repaired.

On my uniform belt I have a S&W clip point locking folder that I've carried for about 26 years.