If I had your equipment the power amp would be the next to last item I would change. I think you would a bigger bang for the buck with a better preamp and/or switching to a full ribbon Maggies.
Normally I would agree with Onhwy61 on the preamp but a Wadia 850 into a Pass amp sounds pretty good. To get a preamp that would sound equal or better would probably cost a lot of money.
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