This would be a great boat for Winnipesaukee and I've heard Fay's is great to deal with -$9.2k
http://faysboatyard.com/?page_id=62
I think you'll find 18 feels pretty small on Winnipesaukee.
Here's another good option - $16.7k -
http://www.melvinvillagemarina.com/2...l-235-ssi.html
I've had good luck just taking a day and driving around from marina to marina with cash in hand. Mid week is best when it's quiet at the lake. The last 3 boats I've purchased I ended up getting about 20-30% off the asking price by flashing a big stack of $100 bills.