My 12-yr-old son is growing fast. He'll be man-size before long--his feet are already bigger than my size-9. He'd like a good quality general-purpose knife for Christmas. I think a folder with a clip would be most useful because he likes to carry it, but a fixed blade is also fine. After looking over the EDC threads I've noticed Spyderco, Kershaw, and SOG listed pretty often, so I'm looking at those on Amazon. Trying to keep the price under $50. Any recommendations?