Until recently, I had always booked for romantic retreats for adults only (we now have a son, and are going for family friendly for the forseeable future) - we've done Swan, Dolphin, and Beach Club. We really love staying in the Epcot resort area. (When younger, I also stayed at some of the moderates, and I would say _definitely_ go with one of the deluxes.) I've always requested king beds, but they will not gaurantee them at the Disney owned resorts. I have never had a problem getting them, but I always worry because DH is 6'4" and is miserable in a double bed.
We could book king rooms at the Swan and Dolphin. I eventually decided I would rather gamble on not getting the king bed and stay at either YC, BC, or BWI. (We're trying out the BWI for the first time next month, in one of the Garden Suites people have suggested.) I really love the BC because I love being able to walk downstairs and over a bridge and finding myself in Epcot. I would be tempted by that discount, though...
We're planning on trying one of the monorail hotels next May so we can be close to MK for DS. Before we had him, we never really considered them simply because we would rather be close to Epcot and Disney MGM. Particularly during the Food and Wine Festival, which we adore.
How much time do you plan to spend at your resort and how much time do you plan to spend in which parks? Knowing that might help you make your decision.