The way my room is set up will not allow free standing or on wall surrounds. I had no choice but to install in walls in the ceiling. After doing some listening I picked a pair of Boston Acoustics. About $175 a pair. I am really pleased with their sound, and they mate with my Def Tech's quite well. Don't remember the model #, but they are somewhere in the middle of their line. Very easy to install, too.
BTW, I listened to some very expensive in walls that really sounded quite bad. Don't buy a name - let your ears decide.