I will be forced to use in-ceiling speakers for the 3 rear surrounds in my 6.1 HT. I will be using Paradigm Atoms and CC-170 in front. My ceiling is 9 feet tall with each rear speaker 2 to 3 feet behind the listener. My question: is it more important to have timbre matching surrounds (i.e.-Paradigm CS-50R) or comparable surrounds with an aimable tweeter (Niles, etc.) for HT? I have heard conflicting reviews about this. The Paradigm dealer (i.e.-salesman) stated that the Paradigms had a wider dispersion and did not need to be aimed. Others swear by the aimable tweeters. Any thoughts are grossly appreciated.