Do a search of 'completed listings' to get an idea of what they've gone for on eBay. "Reasonable" can mean a lot of different things, particularly in the Northeast..... We bought our '66 2-door a couple years ago for a bit over $3K, and it was in what I'd call good+ condition: some dings and chips, tiny amount of surface rust here and there, solid floors, B20 w/30K miles on it. It originally came from the west coast and had been in storage for some time. It immediately needed a tune up and ball joints. A wagon in similar shape might go for slightly more, though it does seem that a lot of people like the 'coupe.'
I'm originally from RI and still spend time there often, so maybe you'll see us in 'the Bird' sometime up around those parts!
Tom
NYC