Love your plan. Those speakers are special. I agree with @erik_squires on Marantz. He recommended Marantz to me and I am very happy.
Talk to Brandon Wade at Apollo audio systems. He owns Ulfs and also makes some nice high power SET amps that are perfect to drive them using a preamp out signal from your Marantz. then you put your 2 channel sound system into a second input on the amy (you'll have to ask Brandon to build you an amp with 2 inputs).
Jerry