on their eighteenth birthday, which one should it be? Include your reasoning and preferably a picture of said knife. My choice would be the Spyderco Manix 2 with a flat grind, modified to be in 154 CM steel. The blade shape is great for all-around utility, the lock is reasonably strong for most outdoor and indoor purposes, the choil and excellent traction provides added safety for fingers, and it wouldn't be prohibitively expensive to mass produce, especially with the less expensive 154 CM.