DH & I are considering our 1st trip to Disney without kids (they're all grown up). Looking to stay 5 or 6 nights, sometime between late August or September 2010. I noticed the "free dining" ads, and I know that this is a really good deal. My question is: Does anyone know if you can "upgrade" the free dining plan to either the "Premium or Platnium" plan? If so, what is the cost, and IS IT WORTH IT. We've taken several "all-inclusives", but never to Disney.