I went from a cheap Sony, rated at 100wpc to a Pioneer Elite, rated at 110wpc and the difference was like night and day. So, I don't think the wattage ratting had a lot to do with it. From what I've been seeing so far, perhaps it's the power supply that is more meaningful, but I don't know how those are rated.

https://docs.google.com/spreadsheet/ccc?...amp;usp=sharing