If using the estimators available on the internet to price real estate was useful, buyers and sellers wouldn't need professionals who list and sell property every day.
Pricing is not as simple as Internet website developers would have you believe.
I would go look at the house, get to know the neighborhood, see the extras, go see other property, consult a pro for homes you probably aren't aware of for comparrison, and make your own -educated- decision.
Of course choosing a local real estate pro can help you save a lot of time.
(Not me, I'm on the Cape, but I can help you choose a local pro when you are ready.)
(Please note: when you choose an answer as a Best Answer, or at least give a thumbs up, it helps those who answer questions here.)