Sorry for your loss.
But that is an incredible gain. Those are two very different amps. I have to agree with @knotscott… you have a chance to biamp… something most of us could never do.
First question, are you willing to commit the funds to buy appropriate speakers to one or both of these pair of amps? My rule of thumb is 30% speakers, 15% for each amp , preamp DAC and streamer.