Just note that the 1 year upgrade credit thing apparently doesn't apply to the subwoofers, so you should buy as big as you think you'll ever need... I know that convinced me to try to find a way to afford the 12D over the 8D.
Speakers: Aperion 6T, 5DB, 6C, 12D
Receiver: Denon AVR-3808ci
Monitor: Panasonic TH-65PZ750U
DVD: Denon DVD-1920
Blu-ray: Playstation 3