I'm sure I'll be one of the only ones to say so, but......
...we just didn't like the Grand Floridian. Our visit there for dinner on our trip in January provoked multiple comments from both DH and DS that "they were glad we were staying at POR". The "elegance" (though undoubtably beautiful) was just not for us. Give us the bayou any day.
Staying on the monorail loop would be lovely, but we had a great experience with the buses at our mod resort so that perk in itself would never persuade us to stay at the GF (admittedly, however, it wasn't "hot" when we were there). Plus our favourite park was AK, and you can't take the monorail there anyway.
If I were going to pay the money for a deluxe, it would be the Poly or the WL. The theming at those locations are more suited to our family's tastes.
No flames please.....just another humble point of view.
Enjoy your trip, whatever you decide!