You have much to learn before you make this move.
You have missed an earlier thread. The OP did learn quite a bit, and has already sent back 2 new, different grands, not before having techs in to try and set them both up for the room. Finally the OP has been test driving a used 'D' loaner at home, before taking the plunge to get a new one sorted out. I'm sure it was definitely worth the trip, even if the end result is that all the 'D's were excellent. Hopefully we will get an update at some point after it arrives/during setup.