Too bad you couldn't audition the SM65. It could have been ideal if you could bring both SM65 and the Kipsch for comparison. You could maybe bring SM55 and find Klipsch RB 61 II locally for in home audition just to get an idea? I haven’t heard any Def Tec before so I cannot comment on it. But keep in mind that that you have limitation on depth of your future center speaker.
Whatever bookshelf speakers you decide, make sure you can find a decent matching center with depth around 6”. Center should be tonally matched with your L/R so it has to be at least same brand, preferably same model line. Part of the reason I recommended Klipsch was they have Synergy C-20 which has two 5.25” woofers and the depth is 6.25”. Even if they are not the same model line, they have the center fits your requirement. You will have to ask Klipsch owners whether the center is good or not. By the same token, you have to look into whether Def Tec have decent center of which the depth is around 6”. Consult Def Tec owners here in AVS forum. You will get much better response.
Another thing you need to keep in mind is that the system is 90% movie/TV. When I changed my speakers from Ascend 340SE to Energy RC series, I noticed that movie performance was tad better with Ascends. But I liked Energy RCs much better for music. Spending more doesn’t always guarantee that you will get what you want. If you narrowed down your choices to a couple of brands, I suggest you again to go to each (Klipsch and Def Tec in your case) owners threads and ask which is better for movies. You will get much in depth response this way.
P.S: I also noticed that you might not need to move your couch upto 8ft. The recommended L/R angle is between 22 and 30 degrees. If the distance between L/R is 9 feet, the LP can be 9fh or a bit further away.
http://www.avsforum.com/t/1253344/front-speaker-placementEdited by m9610172 - 8/19/13 at 9:27am