I often open carry a Battle Horse Nessmuk or mini bushcrafter around the city. The bushcraft style blade is just about the farthest thing from a black tackykewl military style assault knife there is, and it never gets a second glance.
My humble suggestion is that you look at BHK, LT Wright, or other bush crafty blades or even a good Finnish Puukko. They are often well under $200 and they well made tools that will do anything one needs a fixed blade knife to do, they are not flashy and do not draw unwanted attention.