@marktheshark Does the ideal solution have local file serving via hard drive or network storage device as well, or do you plan to only stream?
One suggestion is to find a quality preamp with DAC and streamer built in and use your Yamaha A-S2100 as an amp only (you can set the unit to bypass its volume attenuator in the back). This may give you the oomph you are looking for while also expanding your options.
I am an Aurender dealer and can tell you the Aurender A15 might fit the bill. Compared to Bluesound, Aurender will have more of everything (clarity, separation, stage size), and the preamp stage is very linear. This might work well knowing that the Yamaha is a bit more relaxed. The A15 could stack just above the amplifier and add to the centerpiece design you are seeking.
There are other solutions as well. A Modwright CXN V2 might be a more cost effective way to go (Cambridge CXN V2 whose analog stage has been modded to a hefty tube-based circuit and quality linear power supply). The A15 does sound better, but at a higher price point.