We tend to hang out at Cellar Masters and Michaels, so we should have a good feel for what is available on the ship. I doubt we will ever go to the MDR.
I checked again and, at least for us, there was a few Sky suites available for $1000 less than what we paid. Sky suite is approx $3500 and Celebrity suite is $4500.
Solstice is sailing the Pacific Coast cruise on 9/16, with the same itinerary as the original Millennium sailing. We have been moved to a new Sky Suite, but they are still moving people so the sailing dates aren't public.