@jl35 - what are your source and preamp? A significant factor of amp choice is system synergy with your components. Your Khartago might work better then the A21 in a specific situation. However, remember that the OP is going to drive the amp directly from the Oppo player (which is all solid-sate LM4562 op amps). True, they are FET op amps, but it is going to be very dry sounding coming out of the gate.
If mancub1 goes in and listens to different amps that are connected to completely different source and preamp components, he will not hear exactly what he will get at home. Granted, listening to amps is a very important factor, but so it proper component matching.
I always try to listen to what the OP is trying to accomplish and recommend things based on what he wants instead of what I think is the best amp or device.