I just bought a 42" hdtv and a 360 elite and now I would like to invest in some surround sound (5.1). I noticed that the only receivers are A/V at places like bestbuy and circuit city, but I have like 8 inputs on my tv and am all set on the video side. However, I need to be able to hear surround sound audio on: -my pc which has stereo out and "digital out" (which is a 3.5mm plug, not optical) -my tv which has stereo and optical out -the 360 which has optical/stereo -the dvd/vcr which has stereo and also coaxial (but Im not sure if this is just for running out cable since it's labeled antenna out) -and last my wii which has stereo out Anyway, I have a few very noob questions. Am I really going to notice the difference between optical, digital, and stereo out? Also, do any receivers accept this "digital input" as my computer calls it? Do any receivers have just audio so I don't have this expensive piece of equipment I am only using half of? Lastly, what is needed to actually HEAR surround sound (5.1) as far as the source. If I have a QAM tuner getting HD from my cable in the wall and run an optical or stereo out from my TV to my 5 channel speakers, will it have surround sound or is that just reserved for things like DVDs and the 360. Also, if I have an older dvd player will it be able to output sound to the speakers as surround sound or just stereo? I know there are a lot of questions, but to you all who know a thing or two they are probably answered by a simple yes or no since I am just now figuring all this stuff out. I'm assuming the word Dolby will be in someone's response, but I have no idea what that means... Thanks guyss!