I currently have a Yamaha 5.1 channel (claimed 100W/C) receiver driving a Monitor Audio Studio C. Channel, 2 Monitor Audio 9i's for fronts and 2 old ADS 810's I use for rears. I am seriously considering in investing in a 990/7500 Pre/amp combination from Outlaw Audio. My question is should I first upgrade my rears to the Axiom QS 8's? The ADS 810's are old but they sound great when connected to a good 2 channel amp. Unfortunately my Yamaha Receiver does a lousy job of 2 channel and I am not terribly happy with it for 5.1 performance. I look forward to your replies. Thanks in advance.