Hey guys I actually work at the Saratoga Springs spa. I recommend you check us out because the Grand Floridian is closing and we will be the only full service spa in Disney property. The other locations are actually "health clubs" so you dont get the whole spa experience with them. The spas are run by a partner company called Niki Bryan, here is the website which lists all locations, services, and prices.
http://www.nikibryan.com/
I do recommend you book soon because we expect a huge surge of business due to the closing of the Grand.