WDW has 4 categories:
Value All-Star Movies, Music and Sports; Pop Century.
Moderate Caribbean Beach, Coronado Springs, Port Orleans French Quarter, Port Orleans Riverside.
Deluxe Animal Kingdom Lodge, Beach Club, BoardWalk, Contemporary, Grand Floridian, Polynesian, Wilderness Lodge, Yacht Club. Of these, Grand Floridian is the flagship resort. Walt Disney World Swan and Dolphin also fall into this category. Whilst they're bang slap in the middle of WDW property (between Epcot and MGM), they're not owned by Disney and come in cheaper.
Home Away From Home This category comprises both the DVC resorts (which are also available to the general public) - Beach Club Villas, BoardWalk Villas, Old Key West, Saratoga Springs, The Villas at Wilderness Lodge - and the cabins and campground at Fort Wilderness.
Both the Values and Moderates are motel style accommodation (i.e. entry to the rooms from an outside walkway rather than an inside corridor). The eating option at the Values is of the foodcourt variety. The Moderates have both foodcourts and restaurants (I'd say Theme Park standard, to give you an idea of what to expect). The top-end restaurants and best bars are to be found at the Deluxe resorts.
You pay a premium to be onsite (for the same price you'd get a far superior hotel offsite). On the whole, the Deluxes are in the best locations. Animal Kingdom Lodge, though, is out in the boonies (near the All-Star resorts) and, for that reason, tends to come in cheaper than some of the other Deluxes. The most expensive Deluxes tend to be the Epcot resorts (BoardWalk and Yacht/Beach Clubs) and the Grand Floridian (which is the most expensive of all).
For an additional £300, I could certainly be persuaded to stay at a Moderate rather than a Value. All the Mods are nice in their own way, but the two Port Orleans resorts definitely have a charm all of their own. And you have water-taxi access to Downtown Disney. Both Caribbean Beach and Coronado Springs are a bus, taxi or car journey from almost everywhere.