You are going to go through a few knives before you find
the one. I still like accumulating knives, but
the one for me seems to be the Zulu jack pattern. Those are a bit higher $ wise than what you're looking for. My suggestion is that you go to the Knife World website and sign up for their free three issue subscription. Then, if you like the newspaper, buy a subscription. Check out some knife books in town, there has to be about a hundred used book stores in NYC, you will stumble on some knife books. Also, you can check the local library book sales for knife books, and any discount chains in the city.
Removing any trade or office environment from the equation, a small jack, similar to the Huckleberry Boys knife, should be perfect for use and size restrictions. Queen makes a small stockman, I got one and later gave it to my baby sister. Other than not having a sharp edge, it was very well made

. Right now I'm carrying a Schatt and Morgan premium stockman from the Heritage line, I would try to find one of the jacks from the 2011 line, or if you can, cherry pick through the 2012 cattle/stock series. It also sounds like the Case swayback jack or swayback gent would be a perfect choice for an office or trade. I had one and in the search for better and greener pastures, I sold it like a fool. Lots of great patterns out there from Case, Queen, Canal Street and Great Eastern.