Just seen this discussion and might be able to add a few notes. First, the integrated amps are all great but they do get better as you go from 270 to 370, 470 and 600. Now, the 650 seems to be a big step up from the 600. I have heard the 650 but not on my system. So hard to say how much of a step it is from the 600 but I have been told by somebody who has done the direct comparison, it is a significant step. When Accuphase releases a new product it is always a step up. Sometimes a small, sometimes a big step. However, with all this said, the source is still the most important thing and it is more important to spend a lot of the money there. Even the E270 is already very, very good. Anybody who gets into Accuphase should also be aware that it is all about time coherency. this is where the name Accuphase comes from. So Accuphase can give you a very musical system but it really needs the entire system to be serious about time coherency. Otherwise, the Accuphase will not shine.
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