Magooch has some good points and not to throw a monkey wrench into your plans for a poly boat, but are you sure you want to stick with poly? CD has a "Thermoformed Composite System", TCS for short, that I feel is fantastic. Lighter than poly, very strong and durable. Little more expensive than poly, but not as expensive as Fiberglass or Kevlar.

My husband paddles a Kevlar boat and if we go over the same stuff (sometimes unavoidable), I have less "evidence".

Fiberglass and Kevlar have their advantages as well. Weight, strength, repairable if necessary. TCS is repairable, not cheap, but can be done (damage was not due to an issue related water. Let's just say from now on, if someone else ties my boat down I check it BEFORE we take off) Not sure how one would permanently repair a poly...

I've heard stories about problems with the hatches leaking in rough water with the poly boats. Something about the way they're sealed to the hull and the flexing of the boat(?). Not too sure how current that issue is.

But these are a couple of the reasons I'm not looking at poly for my future open water boat...