Save money and be close to the MK?
That's easy - Fort Wilderness. You can stay at a full cabin wit hall the amenities for about $230 a night and sleep a large family.
I prefer the WL, but depending on how many rooms you would need, your requirements, etc. consider FW as well.
Otherwise, I love the Port Orleans resorts. They are great hotels, close travel-wise and can be had for about $79 a night depending on the season