since i"ve been on my huge freakin meter mission it has come to my attention that there are just to many of these big metered onkyo"s to keep up with. Why are there so many ( M models ) and there dosnt seem to be much difference. So far, m504, m506, m508, m510, m5060, m5030. They all look pretty much the same, and i"m sure i missed some. I know the wpc is different but jeez where the hell have I been. I am now thinking what I need to do is just find the cleanest one I can and not be to concerned about wpc, their all strong on the power end. It also seems like if you keep up with it you can find a good deal on the bay, price is all over the place. Another question I have is will I have to find a pre to be able to play cd"s, i"ve never owned just an outright power amp before just a buttload of receivers. Any advise is appreciated, thanks, Roost