We pay $185 a foot for a 45' slip (53' LOA boat, but we pay by the length of the slip, not the boat) for docking May 1 to Late October, haul out, pressure wash, block up, and Winter storage. We pay an additional $1000 for 50 amp service at the dock and 2.5% for "Environmental fee" which is just "profit". Our marina is in Hampton Beach, NH, about a mile from the end of Route 101, so a pretty easy ride from southern VT (I'd take 202 east to 89 to 93 to 101).
We are 17 Nautical miles from Rockport, MA, 10 nautical miles from Isles of Shoals, 15 nautical miles from Portsmouth,NH 80 nautical miles from Boothbay, ME and 65 nautical miles from P-Town.
We like the location because there are are countless restaurants/bars in walking distance of our slip, fireworks every Wednesday night in the Summer that we can see from our aft deck (or from less than a mile offshore if we take the boat or dinghy out), at least a dozen places to see live music every night all Summer, we get diesel at wholesale price at the fisherman's co-op across the harbor, and the open ocean is a 5 minute ride from our slip. The downside is that it's a resort town so traffic can be awful if you have to drive anywhere while the beach is busy (we plan car trips carefully in Summer).