I've been building my system slowly over the past two to three years and finally have a completed set with a nice tv and 5.1 setup. The first piece I bought was the receiver, a Pioneer VSX-409. I have a full set of HTD Level 3's connected to it, and a Sony SA-WM40 subwoofer. I've had a few people tell me that the receiver is the "weakest link" in my system, and that it should be upgraded. I do sometimes feel that my system lacks the "punch" it should have, considering the amount of money I've put into it. While I do have some money to work with now that I'm out of school, I don't have enough to throw it around on a brand new receiver if it's not justified. Will I get much of an upgrade by getting a "real" receiver like a Denon 1800 or Onkyo 600? I'd really appreciate your thoughts on the subject!