Very good question. I am certainly considering the Marantz AV7703. I wish I wish could provide some educated thoughts on your post but all I can really say is that when it comes to prepros and av receivers, they will have to be replaced more often than speakers and amps.
Paradigm Studio 20v5-fronts
Paradigm Studio CC-490v5-center
Paradigm Studio 10v5- side surrounds,Monitor surround 3v7-bck surr
Oppo UDP-205/LG 65C6
Outlaw 976 prepro/ Emotiva BasX A-700 amp
Power Sound Audio 15S