I had considered switching my Disney dates w/ my US dates. The entire trip is from 12/29 - 1/6, with Disney being at the front end. I think I will leave it alone, though, b/c I've done Disney a lot and I think US will more enjoyable at the end of the week when the crowds start to disperse. We haven't been in 10 years and my DD9 has never been. This way, we may actually get to enjoy HP some as well.
I wonder if I should lose a night at Disney, too and add another to my RPR dates.