I truly recommend the Outlaw RR2150 stereo receiver. It has a very transparent, superb sound, plenty of power to drive most demanding speakers; it also has a USB port, for digital in and a special subwoofer output with an excellent crossover (60Hz, 80Hz, 100Hz). Got mine together with the Ultra X12 powered sub and, together with the Monitor Audio RX6 floorstands, gives us a lot of joy.
For the USB input I recommend the Schiit audio WYRD decrapifier, which allows audio from the PC USB to sound similar to a good CD player.
This system, which I built from scratch around the Outlaw receiver, cost me under $2500 (cables and all included) and it goes with great dynamics and soundstage for a true 16 Hz - 35,000 Hz range (with the sub crossed at 100 Hz - my preference).
What does this setup do? It basically pulls the hardest to drive signal (low frequency) from the receiver amplifier and sends it to the 350 W power amp of the subwoofer.
This way the receiver has such an ease to run the 100 Hz and up wavelengths into the speakers, which in turn are also free from dealing with the low signal as well; that goes all to the subwoofer.
And that's why I challenge anyone with any 2 speaker, highly priced, system, to A/B compare it to this one.