I have a Motion 8 center, Motion 12's in the front and Motion 10's in the back. I am driving them with a Denon AVR-591. After some research and a call to ML I found out I need a receiver that is 4 ohm. My Denon is 8 ohm and is only 75 watts. I am looking at the Integra 40.4 which is 210 watts at 4 ohms. My question is will it make that big of a difference in sound? They sound good as it is. Is there any other AV receivers I should look at?