Other posters have already mentioned thumb opening as a good alternative to spring operated. I use an inexpensive Gerber that I got at Home Depot. The blade's about 3", it has a very narrow profile, and the blade is half serrated. Also has a clip on the side.
With a smidge of oil on the mechanism, it will pop open with just a flick of the wrist. Very dramatic. Probably even more dramatic if you flick the knife overboard. The thumb operation is super easy, and definitely one-handed. It's a locking back and with a little dexterity, can be closed with one hand.
Just google: Gerber paraframe stainless serrated edge