Any decent knife can wow me once. It is the second wow that I look for. The one that comes after I have been using the knife for a while. When I look down at the knife in my hand and realize all the "new knife" excitement is gone and I am using the knife because it performs better than I ever expected and I realize that I really, really like this knife and add it to my "do not sell" list.
That, my friends, is my second wow time and very few knives have reached that point. Off the top of my head, I can think of two, maybe a third:
CRKT Prowler
Kershaw Zing (US made)
Benchmade 531 (last one-wowed me twice but is not on my keeper list yet)