I picked up a pretty good deal on a Yamaha rx-v420 as my first home theatre system. Now I am looking and realize that I can get rid of my RCA audio video switch box and use the s-video swithcing capabilities of the next higher model the 520. ( my 420 only has composite video switching). My dealer says that it is not good to switch the video signals in the reciever and I am better off with a un powered manual s-video switch box, and not to switch video in a receiver. So this would mean a manual step each time, or to use the composite input to my s-video capable tv. Is ther any real issue with switching video in the reciever, does it add noise and drop signal strength? or am I being sold a song. The model 520 or 620 are getting hard to find so I am not sure if I should waste my time looking? This years Yamaha models would require me to get the model 730 in order to get the required inputs and multi room output. Or I can get a ggo deal on a Sony strde1075 Help please!!!!!