I’m going to say that anyone getting more serious about pocket knives “must have” a traditional and a Spyderco. More specifically a GEC #15 or #74 as I personally feel they are some of GEC’s best. For the Spyderco, a PM2 in a fancy pants steel. I think getting these will help someone appreciate many things about knives even if they decide neither is for them. Also if not their cup o tea, they’d be easy to sell without losing much if any cash. However for me these will always be in the collection and are must haves.