gorgeous property and setting, Atlantic... Truly stunning...
I did a quick search for pesticide drift and, as you probably know, there are a TON of articles and stories in regards to effects and whatnot.. I think you should absolutely do your due diligence with this and talk to the crop field owners about their pesticide policies, and what they actually spray so you can look up its effects on living beings, and then talk with some of your potential neighbors to see what they have to say.. One article I read stated one home owner had a really tough time selling their property due to the pesticide drift issue, so you might try and check if home owners in that area have had trouble selling their properties..
I read another article about things you could do to minimize the effects of pesticide drift, such as planting, I guess, bushes or something that would create a barrier between you and the crop fields so the drift would be minimized or stopped by the bushes..
Man, that's really a tough one because its such a gorgeous area.. Keep us informed...
Friendship is like peeing your pants.. Everybody can see it, but only you can feel the warmth..