Another vote for ARC.
Listen to one first to be certain it has the basic sound profile that you are seeking. Next, consider how it will change/update the sound of your current system.
Also, buy the best (most recent model?) you can you can afford...
I recently purchased the ARC Ref6 SE, and I am continually impressed with it's Sound Q, and Build Q. The interface uses the typical buttons and dials, which is good enough for me.
Good luck,