I actually have two questions I hope you guys can help me with. (1) My HT is in a small space (13.5 x 13.5) and my listening position is up against the back wall. Because of the very weird way this room is designed, I will only be able to place a single back surround speaker in this room and it will have to be positioned right above the listenting position (i.e., on a parallel line with the side surround speakers). QUESTION 1: given this set-up, is it wise to get a back surround speaker at all? (2) Assuming that I should get a back speaker ... My speakers are as follows: Polk RTi150s (F/L fronts), Polk CSi40 (center), Polk RTi38 side surrounds, and VFT-2 subwoofer. I would like to stick with Polk, but I'm not sure which Polk speaker would be best for the back surround position. QUESTION 2: What Polk speaker should I look at for the back surround?