I'm going to buy a Marantz reciever and couple it with Audio Pro Black Diamonds, Audio Pro Black Vector, Audio Pro Image 11 and an audio pro sub (active). I've been looking at SR 5200 and SR 6200, and I wonder, do I need the extra power of the SR 6200? Otherwise the features are very much alike (except for the CS 5.1 of 6200). I've also seen a model called SR 5200G, which pricerunner told me, doesn't support DTS 5.1. Is there such a model? Never heard of it before. Strange thing is that it's supposed to handle DTS-ES 6.1 (although not DTS 5.1) and it's not supposed to handle DD-EX 6.1 (although it handles DD 5.1). It all seems strange somehow. Also can Marantz handle 4 ohm impendance speakers? Lots of questions there, hope you'll have the answers! Thanks in advance!