My favourite all-round folder, right now, is the Buck Odyssey 182 - 3.25" blade, ats-34, carbon-fiber scales, liner lock. A versatile blade pattern, once I modified the pointy tip a little. And, a comfortable and secure handle, with a finger choil and a grooved thumb ridge. Looks great, too. And a bargain price for what it is.
For a smaller knife, I really like the Spyderco Dragonfly in SS.
And, for a beater knife, the Normark American Hunter, also called the EKA Swede 92. Lock back, 3.5" blade, Sandvik 12c27, brass frame, rubber scales, can be easily taken apart and put back together, not one-hand opening. High quality at a bargain price.