I have 2 recommendations, ….

1. North Reading, Ma. I lived there for 18 years, lovely town, but may be way past the $600K mark by now, approx 15-20 miles north of Boston. No crazy Maine winter unless the whole region is getting hit by that. Less than 1/2 hour to most of the north shore beaches. 15 minutes south of NH. Very good forest coverage.

2. Almost anywhere in the southern tier of Maine, though you’ll have more driving distance to most things you may wish to do