I have owned the E-380 integrated for a couple of years and have similar impressions on the sound characteristics many have noted. Quality of the build is excellent and the price is getting better for US customers I understand so it would be a excellent foundation for a quality system.
Funny how some words can capture a sound signature quite accurately, I agree with the polite quality mentioned, there is an understated nature to the sound but it is far from dull. I think that perception is in part due to the balance of many qualities and a really black background. I live in a condo so need to show some restraint in the decibel department, but when you turn up the volume the dynamic qualities present in no uncertain terms and never appear strained.
I am not sure what you will be pairing it with, synergy is no small issue, but a great choice to build or evolve many a system IMO.