I could be wrong, but I thought both Russound *and* Nuvo were supported by Elk. You should be fine either way. I've been comparing the two quite a bit lately - and am having a hell of a time making up my mind. There are things on paper that sound much better about the nuvo (the musicport, oled displays, ultra-low power consumption during standby) but some with more experience than I have stated that the Russound sounds better (has more power) and is a little easier to work with.
Good luck - please share where you end up - I'm certainly curious!