My everyday carry knife is currently a beat-up Opinel, though I just purchased a CRKT RSK Mk5 for a survival kit. I'd like to get a good one-hand opening, locking folder under 4" long folded. I prefer Made in USA, as light and thin as possible, but I also want a relatively thick blade that can shrug off rough treatment. I should also mention that I tend to lose things so I don't want to spend over $50 and preferably substantially less. Any suggestions? Thanks!