Hey Peter - Great input! I'd forgot about that. So the Yara's are 90db at 4 ohms and the Era 5's I've heard are 85db at 8 ohms and sounded great in the small room they were in pushed by a Nova. I don't recall whether they were pushed very hard though. The Ohm Micro Walsh that we both have (I have short, Peter has tall) is 87db at 6ohms. How do you think they'd do? I was looking at the size of the OP's room (unfortunate proportions), and what they listen to also. I thought in a smaller space like that, and a square room, omnidirectional may fair well if the Nova had enough juice.
