On and off duty I carry Benchmade more than any other brand. I have several of their auto-opening (switchblade type) knives.
+1 Kershaws are great knives. I have several Ken Onion "spring assisted" opening Kershaws.
The pics below are of some of my Benchmade's
In my limited experience I have found Kershaws, every model of theirs I've seen, to be outstanding. I'm sure someone else will be able to chime with with a particular model to fit your bill.
Edit: Also out of the box, if you do choose a Kershaw, it will literally be sharp enough to shave with.
+1 Kershaws are great knives. I have several Ken Onion "spring assisted" opening Kershaws.
The pics below are of some of my Benchmade's