Here is my setup, still in the works. I am having trouble with the speaker selection. So many people give glowing reviews on the Polk M70 especially for the price. I am thinking on going with M70 for R and L, M30 for rear and sides, and CS20 for center. I like a lot of base so I am looking at the SVS PB12-NSD for the sub. The sub costs almost as much as the rest of the speakers. Is this overkill on the amp or underkill on the rest of the speakers? Should I stay with the Polk series sub?, but I hear it can be weak. I am also looking at Aperion speakers, but they are obviously more expensive. Receiver is Denon AVR-1910. I am going to try without an amp at first, but I am willing to purchase if necessary. This is a dedicated HT, in a 16X18 room.