I will definetly be following this thread with interest. My living room has very similar dimensions but I don't have the long wall, it's pretty square. But I have the same issue having the tv in the corner, so I understand the diamond shape problem. I have the sloped ceiling as well. At first I thought monopole surrounds would be good. Then I thought maybe I would still notice an improvement with the QS series. Now I am thinking monopoles again. Yowsers!