Im looking to upgrade from my Pioneer VSX-d906s receiver.I only have $300 to spend and want to get a used one.My wife says im going over board and the pioneer sounds fine.If i get aHK or yamaha is it going to make a huge difference in sound.I have Infinity sm 155,s for the front and psb surrounds.Im also getting a second pair of 155,s for the b side.I only listen my music on 2 channel and the reciever has plenty of power..but i think i could do better?Any advice?Also should i hook up my equipment ..like my dvd player to the video outs on my reciever?Does that change the sound?I just plug the sound in with digital out but not the video.