How about a hybrid? You'll get the solid state low end with the sweetness that only tubes can provide. Take a good look at the Butler TDB-2250s you see here on Agon, that is an extremely good amp for reasonable money...
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2 channel amp to upgrade Pioneer Elite Receiver
I use surround about 10% of time. In fact, I'm fine with built-in Elite's surround amps. The front two channels, however, seem a bit too neutral for my taste. I would like something solid state that is a tad warmer and fuller. I will hook this amp to the "pre-outs" of the receiver. Please give recommendations.