I'm out of my collecting phase now and though I have a bunch of them from the major brands for the last 7 years or so I have been carrying a Spyderco Native5 FRN. It's the right size for my hand, light enough and the lock is sturdy. I can easily open/close one handed and the blade is usefully sized. USA made. Due to the lockback's closing bias I never have to worry about the blade opening when I don't want it to. I would rather it not have a choil but that would change other dimensions and I don't think it would work.
This is usually paired with a Victorinox Ranger or Climber. If I could only carry one I would ditch the Spyderco. SAKs are too useful.