Best Amp With Some Warmth and Midrange Magic To Pair With The RAAL Requsite SR1a's?

I just ordered a pair of these after hearing them fairly extensively in a couple systems. These amazing ear speakers have absolutely incredible speed, detail and clarity, and very surprising bass. I'm not sure you could equal those qualities in a speaker at 20 times the price. However, I think they are capable of moving from amzing to absolutely magical when used with the right amp. That would be one, which brings some warmth and midrange magic to the party. 

Normally this would clearly mean a good tube amplifier.However, the numbers of tube amps that would fill the bill are greatly narrowed due to the fact that, to perform optimally, the RAAL's require 150wpc solid state, and 100wpc tubed. And there are no shortcuts. As one reviewer experienced, as also did my friend and I, even the excellent ARC Reference 75 tube amp (with a rock solid 75wpc) came up a bit short in our listening. As did a very respected solid state amp rated at 100wpc.  

I would appreciate any recommendations of warmer solid state amps of the necessary wattage, or any potential tube amps that come to mind. My finances would great appreciate limiting the cost to $2500.00 or under, used. Older amps are fine unless they are at a point where they would need to be recapped/refurbished at significant expense. 

Any recommendations, thoughts or expertise is greatly appreciated. Thanks.