Just bought a pair of CM1 S2's (will become rears) and a nice matching center channel. Also got a Marantz 1605. From what I was told it was a 100wpc but looked it up after and its actually 50. I dont crank movies and music super loud. At medium volumes will this do the trick or am I going to regret not getting more power? I also am planning on putting some CM5 S2's in the front eventually. I am assuming at that point I will certainly need more power? Thanks for the suggestions!