I'm considering getting the epic 80 set (with an EP600 instead of the EP500). I don't currently have any A/V receiver. Obviously I want one that will do these speakers justice but I don't want to pay for features I don't care about like 7.1, multizone, upscaling, Blu-ray/Bluetooth/AirPlay, etc. Is something like a Denon E200 sufficient or should I invest in more power? My room is pretty large.