Jimd, I have a pair of Soliloquy 6.3 speakers in a great room 13x28. They fill this room with ease, at 13x17, I would be scared that the 6.5s are too much for yor room. This is sad as I love my 6.3s, and have heard some good things about the 6.5s. Also, I have mine 3' from the back wall and have heard advise on the 6.5 back wall clearance as much as 5'. I have gotten some advise on placement from Soliloquy, they were very helpful. Although they won't be unbiased as to which speaker to buy. There is a dealer in the suburbs of Chicago called "Holm Audio". This is where I first heard Soliloquy, I believe that they carried Coincident also. They might be of some help.
Todd
Todd