Dussun vs Qinpu vs.Jungson vs.Onkyo A-9555 Amps

Has anyone heard more than one of the four integrateds? I have looked at all of the posts I could retrieve,and found varying degrees of info,but am considering one of the four for a dvd sourced 2 channel setup.I have the Usher s-520's,a Jungson DVD MH2,and am looking for the integrated.Thanks for any help or comments.
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