The Parasound is a solid recommendation. You won't find better than a Muse model 3 at that price point, I've seen them around $600. Be aware this is not a model 3 signature. The old Sumo Athena is surprisingly nice, probably around $300. The Adcom you mentioned is a good piece also, might be a bit detailed and edgy with the Rotel, But all of these will give you noticeably better performance than your RC-1070. I hope this helps,
Tim
Tim