Ok, so I currently have a cheap Sony DAV-S500 (http://www.sonystyle.com/electronics/prd.jsp?pid=10491) dvd w/ 5.1 setup. I just started getting interested in getting quality sound but I have a bunch of questions but can only think of a few right now. First off, what makes one receiver better than the other? If I were to buy an SVS 20-39CS Sub would a Denon 1801 be able to handle it? I am kind of short on cash so I'm going to buy the stuff used I think and a couple pieces at a time. Could I just start off with a Reciever, Sub and 2 front speakers and then later on get the center and two rear speakers? Also is an SVS sub a little overkill if I got a denon 1801 reciever (say I can find the reciever for 500). And then I got say $1500-$2000 for the speakrers. And I spent a total MAX of 3000 ( I don't want to spend that much, right now I can get about 1500 to spend to start me off with the parts I think). If I wanted to spend say, 2000 for a setup would it be significantly better than the setup I have? Sorry for including so many lame questions but I really didn't find anything in my searches that qualified under this (i'm sure there are some out there). Also any speaker recommendations? Thanks.