De,
You can grow a LOT more than you realize. A whole lot more.
First of all, nearly all fruit and nut trees and shrubs -- except the clearly tropicals (and citrus...which I would classify as tropical) -- REQUIRE winter dormancy to produce fruit. I would guess 80% of what I'm growing could be grown on your land.
A large portion of what I'm growing isn't actually suited for this climate but, ideally, requires a Washington/Oregon climate. I got most of my exotics from http://burntridgenursery.com/ -- Oregon based. You can surely find a similar site closer to your area but, if not, burntridgenursery is a good place to start and they have cultivars for most of what they carry which could easily handle, and likely thrive, in NH.
Normally much of what I'm growing wouldn't survive here but I have a microclimate in the back yard due to the steep hillside and it being on the eastern side of the house and, thus, blocked by the body of the house from full afternoon sun. AS YOU BUILD YOUR FOREST YOU BEGIN CREATING A MICROCLIMATE, BY THE WAY, SO WHAT ORIGINALLY CAN'T GROW THERE DUE TO HEAT OR COLD OR LACK OF MOISTURE CAN GROW THERE LATER EASILY ENOUGH. You can also create a "microclimate" with a greenhouse and, if you have the room (you do), I suggest a COMMERCIAL hoophouse type (large enough to store numerous tractors in...not the piddly back yard type). I suggest you visit this page: http://opensourceecology.org/wiki/Modular_Greenhouse_Units
The thing is to get started. There is both a time vector for building the ecology and a time frame for learning.
I'd be happy to share with you whatever I know. What I know isn't near enough to satisfy me, of course, but is more than enough to know that you can build an edible forest garden of marvelous diversity.
Get started. Now. That is something I've been advising for some time already. We don't know how many ticks are left in the clock but if you got started now, and approached it as an extension of what you are already working on, you would be well on your way in a year or two. Putting in 50 trees is how I would start. You CAN grow apple trees, cherry, currants, filberts (hazelnuts), chestnuts, gooseberry, aronia, wolfberry, elderberry ... and probably a dozen more of the things I listed. And then there are things you are going to be able to grow easily which are problematical for me (yet to be determined).
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