I recently compiled a list, front page folders, back page fixed blades... Not "every" single knife I want, but a large number of knives covering various price ranges and designs that I want, like, and/or would appreciate owning... I leave it accessible, and so "if" the wife ever feels the urge to buy me a new knife as a gift, she has a reference point where she can turn to, and know beyond a shadow of a doubt, that she won't go wrong in a knife purchase off said list. Rather then shopping without an idea of what is what, and buying blind, and ultimately risking buying me something I won't like, (like say if she buys me Spyderco based on reviews, or came here for suggestions and heard 28 people suggest a pm2, not knowing I really don't like them).
Because the list is so vast, anything she would buy me would still be a surprise, but at least she knows she can't go wrong picking any one off the list, be it a $20 SAK classic limited, or a $1000+ Marfione ANAX, she knows she can't go wrong... (And if I would so happen to purchase one along the way, as I'm sure I will, and i'm content to not want a 2nd, I simply cross it out so she knows it's off the list).