I'm going to be receiving a Harmon Kardon AVR325 shortly, which can do 6.1 and 7.1. I currently have a Yamaha RX-V592, which can drive two center channel speakers, and which has two Wharfedale Diamond 6R bookshelf speakers as my center channel. So I can move one of those to the rear for a center rear and a 6.1 setup, or I can buy a Wharfedale Diamond 8 center for $130 right now and move both of the Diamond 6R speakers to the rear for a 7.1 surround setup.
What do you folks recommend? Am I really going to notice a big difference between 6.1 and 7.1? (And if 7.1 is better, is there a better center for around $130 than the Wharfedale Diamond 8?)