Hi, Kristin!
I am by no means an expert on the GF (oh, how I wish!), but I'll do what I can to help!
Are you staying GV or LV? (I can't remember.) We stayed GV in Conch, and one of the main reasons I chose it was for the location, and the good chance that I'd get the Alice in Wonderland bedding.

Yes, I'm silly enough that the bedding was important to me! I would have really liked the Cameo bedding, but from the information available to me, it didn't look like I had the right room category booked to get it. I'm very much hoping for Cameo bedding in RPC this December (being that I'm partial to the Disney fairies).
I don't think you can go wrong with Conch Key (we even had some Seven Seas Lagoon in our garden view!), but Sago seems to be popular as well, since it is a tad bit closer to the main building and Gaspie's. Conch Key juts out into the SSL a bit further - it basically sits right in front of Sugar Loaf across the marina from Sago, and is very near the boat launch and Narcoossee's.
It will be interesting to see what happens with all the rumors swirling about the room remodel! You could always keep your request as is for now, and then change it once you get closer and have a better idea if/when buildings are going down for refurb.
HTH!