Todd, disregard any reviews you read that speak of "musical" or "bright" receivers, which is nonsense. The Pioneer 1014 which should be out in about two weeks is supposed to list at $700 and will likely be available for around $450 street. Its features apparently will be similar to the 53TX and it should be definitely considered.
One puzzling thing about your setup is that you report that even setting the treble at +12 isn't quite enough with your M60s. There have been a very few complaints that the M60s were too strong in the highs, but the only one that I can recall who complained of not enough didn't have his tweeters connected. Make sure that the connecting straps on the M60 terminals are tight, so that all drivers are actually operating.
