The monorail resorts (Poly, GF, Contemporary) are the best for your ages. Also, as others have noted, rooms are quite a bit larger at these resorts than at the other deluxes, and you'll need that extra space with 5.
We're doing our second Poly stay in about 3 weeks because that was just such a great experience for us. The theming is fun for kids, and the location is great. The pool is also nice. Dining options are great too.