Hi Jonathan,
Congratulations on starting to plan a Disney trip! The Grand Floridian is Walt Disney World's flagship resort and is truly magnificent. My family and I recently visited "The Grand" and enjoyed a dinner at Citricos on property. It was spectacular! Obviously, everyone defines "best" in different ways, and takes into account a number of parameters including budget, location, entertainment options, pools, etc. The Grand Floridian is an outstanding choice, as it's on the monorail (making getting to and from the Magic Kingdom and Epcot a snap), has unbelievable dining choices and magnificent grounds. Other hotels in the deluxe category that I thing are great choices are the Yacht and Beach Clubs, which have another excellent located in the Epcot Resort area. (You can walk to both Epcot and Hollywood Studios). I also love Animal Kingdom Lodge. It's located on a private savanna, and a "room with a view" affords your family the opportunity to step out onto your balcony and see African wildlife.
There are great choices in all three accommodation "levels" at Disney (deluxe, moderate and value). It sounds like you are leaning toward a deluxe property, so you may want to look at disneyworld.com or click
HERE to be directed to the web page that provides a great overview of all of the deluxe properties.
Have a wonderful trip!