Cabelas carry's the Beavertail Stealth marsh boats at the Missouri locations. Go find one to lay in and see what is comfortable. I have had homemade fiberglass and wood ones, way too heavy and no gun holders, dry storage boxes, etc. Just bought a 2000, getting ready to grass up this weekend.
My first choice would be a Mo Marsh Fat boy DP, based just north of me. Good product, but about 40% more than what I spent.
Make sure you separate the layout boats and marsh boats, former for Diver hunting open water and later for shallows. You can spend a day on Duck Hunting Chat.com reading all the pros and cons in the boat section.