$1200 may have been the price when the OP called but perhaps it was less at the time of booking.
I've seen many times that the GTY isn't much cheaper. What seems to happen is that people think choosing a GTY will work out...and yes at times it might...but then their unhappy about the cabin their assigned and come back to complain about it. Same is true with upgrades. What RCI considers an upgrade may not be what you or I would think.
All of this is easy....if you want a certain category/location of cabin...choose it when you book and don't leave it up to RCI.