I am looking for a receiver for a system in a second room. I already have a Denon AVR-4800 which I love but am hoping to spend less for this second system. The speakers are Cambridge Soundworks MC series that are built into the walls and I am not thinking that I need a high powered amplifier however I am not sure about THX. We will mostly watch Widescreen DVDs on this set (Sony XBR - LCD Projection 50 inch) and I have been really spoiled by how good the Denon sounds. Any suggestions? Is THX that important?