The OTL amps are a great suggestion IF you can afford them. Another are the larger VTL monoblocks. Run them in triode for best results and you'll need about 90wpc in that mode.
I prefer low feedback,high current amps. The brands that come redily to mind(without spending an arm and a leg) are AVA, Monarchy Audio,and the amp/preamp section of the Magnum Dynalab MD-208,but that is just me;your tastes may differ. Allow me another personal opinion. The acoustics of the room and speaker placement are important with panels.
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