Audio group of Denmark class D amps will be outdated in a couple of years. Unless there is an upgrade plan. I do not know if that is offered.
We all know Accuphase excels Luxman, Resale value holds ground. Hope your audition goes well!!
Additionally every system will sound different per set up and room acoustics. I think your steps of choosing what works best is a wise move towards whatever you choose to purchase.
Best luck!!