I'm thinking we should take up action in the "danger zones" where we can have influence. Portsmouth-Dover-Durham sounds like such an area. Same thing w/ Keene.
I have lived in Washington (just north of Hillsboro), Concord, Portsmouth and Rochester (where my home currently is). From a pure political perspective, I found Washington (a town with 1 cop and only 500 residents or so at the time) to be very liberty oriented as I believe any small town in New Hampshire is. As the towns get more populated, you find more transplants from out-of-state (unfortunately these transplants are not participants of the FSP) that bring their "needs" of "protectionism" in with them.
If you want to work within the system then I would say you should definitely look into the Concord/Manchester area. First off it's convenient to get to the state house, etc. but people in that area seem to me to be way more politically active. Secondly it is center of the state and you can get just about anywhere you want fairly easily.
I personally don't work in the system anymore therefore I would not find much usefulness living in that area and prefer the seacoast out of the areas I have lived in across NH. Besides the beaches, easy access to the mountains, quick escape to Maine or Boston...you have college campuses and the potential to awaken so many young minds. I believe UNH has a student population of 15,000...if we could simply tap into a small portion of that, it could be a huge win.
Oh wait a minute, we are tapped into that! There is a YAL group at UNH that occasionally joins the NH Seacoast Liberty group. The UNH crowd has increased in size, but they have not reached their potential --- give it time and it will.
To wrap up...I agree with your "danger zones" idea. While I support the Free Keene / Free Grafton / etc. projects, I believe that they are limited in scope and have limited impact on the local populace whereas if we continue to spread across the state then our impact will be felt, seen and celebrated.