Well, you have a lot of fantastic options at that price point. I just wanted to butt in and say that I have just done the same thing at much lower price points. And even going to a sub $500 amp in order to upgrade speakers made a great improvement in my system.
First priority of the new amp will be matching with speakers. I'd ask Joseph Audio or your dealer what they recommend. Also get an impedance plot vs. freq for the speakers if possible. And I'd try to get an idea of what sort of damping factor the speakers might need. That would be my starting point.
The Modwright isn't a full-balanced design, so you won't see as big an advantage of going with a balanced amp as you might with a fully balanced pre (like the 36.5 or an Atmasphere pre, etc).
Then, turn your attention to the synergy between amp and preamp. Major rule of thumb is that the amp's input impedance should be at least 10x the output impedance of the preamp.
First priority of the new amp will be matching with speakers. I'd ask Joseph Audio or your dealer what they recommend. Also get an impedance plot vs. freq for the speakers if possible. And I'd try to get an idea of what sort of damping factor the speakers might need. That would be my starting point.
The Modwright isn't a full-balanced design, so you won't see as big an advantage of going with a balanced amp as you might with a fully balanced pre (like the 36.5 or an Atmasphere pre, etc).
Then, turn your attention to the synergy between amp and preamp. Major rule of thumb is that the amp's input impedance should be at least 10x the output impedance of the preamp.