I will second the Spyderco Endura (or Delica). I have been carrying one every day through 4 generations of change since 1992 and they have never let me down. I especially like the full flat ground models because I like thin slicers.
That Zero Tolerance is nice. I just can't spend that much on a folder. I don't spend that much on a fixed blade anymore unless it says BUSSE on it.