Out of what I have, I'd pick these first.
satin jack tac, Boss Jack, Badger Attack tac, actually any of the Badgers are great smaller knives that I'd not be hard pressed to think twice about carrying in public.
I do carry my Cultellis (sp?) daily and it does not get a second look.
I have carried my Mean Street variations quite a bit, they hide well and are aggressive
The active duty is a nice little knife, but is a bit on the smaller side like the Cultellis, I'm starting to think over putting Badger and Satin Jack sized blades in my rotation soon just to feel it out. Not sure how they will be received though, but I have a way of sheathing my blades so they dont look so aggressive to the regular joe.