For music and HT I am considering Motion 60XT's. Till the end of the month Best Buy is including with this purchase at no charge one Dynamo 700w subwoofer. I am not sure this will be enough for my room 13'x20' and 8' ceiling. Should I consider the Dynamo 1000w or 1500w? The entrance to the room is an opening 8'w x 7'h from the home's entrance foyer. The AVR will probably be Yamaha RXA1060. Also any thoughts on center channel- Motion 30 vs Motion50XT. There are existing in wall speakers for rear surround which will have to do for now.