OK - I'm southern NH, but have to treat this area of the yard as warmish Zone 4 - the wind really creates a very cold microclimate on that side of the yard, especially around the proposed site - aka the top of the hill.
Needs to be drought tolerant once established, able to take wind and lots sun. And give me some winter interest and some shade for the bench. Spread - about 8-10 feet, height maxing at 20 foot. Don't mind pruning but would object to anything that suckers.
I don¹t want an evergreen - in the long view (up the hill) it is backed by pines, oaks and maples and I think would get lost. Great bark or fruit that would attract birds....
Go to town folks... I want to make this happen next spring and will be putting my pennies aside to save for it.
Cheryl