If you are buying a new system, why that amp? Suggest you re-think the amp and go for the Maggies. Your room will be great with them, but as noted, you need power. I suggest you spend your $9000 for used ARC tube separates, but that's just my experience. You can get a good used ARC preamp for $1500 or so and put the rest to as high a power ARC used tube amp(s) as you can find. With tubes, 150 a side should be fine in your room with Maggies. If not, you can always add more later. Either way, you get WHAT YOU PUT IN with Maggies, so they reproduce the source. I don't know about streaming, so I will leave that to others.
Whatever you decide, good listening!
Cheers!