I have a set of Vienna Acoustic Mozarts with the Theatro center and Polk surrounds. I am building a new dedicated home theater and contemplating upgrading my denon-1803 which is powering these. I like listening to 2 channel music but the system will be used mostly for home theater. Recently, I've felt as if my receiver is underpowered as my music/movies haven't seemed dynamic. I also have to set the receiver at 00 to get to a good listening level. Any reccomendations for a receiver, or separates, and how much difference will it make? The mozarts run at 4 ohms. Thanks.