WarrenH---check out a used Mac 402 (with quad balanced circuit). they are really cheap now that the 452 came out. and with Mac, easy to resell of course.
McIntosh solid state amps with both autoformer outputs and the quad-differential topology. As good as solid state will get on Defs. Pick your price; try for monoblocks; you're golden.
Zu's can have a slightly aggressive high treble with solid state. Tubes fare better. Avoid "bright" mps or amps with an overly lean presentation. That said, I had good luck with a Rega Elicit before I switched to tubes.
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