I read the question as "what are my cabling options and which of those options would you recommend ?". For example, switching most/all of the video in the receiver or wiring the video signals to the TV and audio to the receiver ?

I don't remember offhand if the 645 can switch HDMI or I would provide a first pass answer. Will look it up later and try to post back.

M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8