I use Axiom QS-8's with excellent results. I won a contest over there to name their new on-wall/in-wall speaker line, and was supposed to win a set of those new speakers but I had no use for them, so they allowed me to select anything equivalent to the value. I almost went for a pair of M22Ti bookshelf speakers, but I did not think they would improve upon my 170's. Since I had cheap monopole 2-way bookshelves as surrounds, that was the area needing the upgrade. The Q's work wonderfully and make a huge difference in the surroundfield. They are not cheap, and prices just increased over their entire line. They are now $530/pr. If I had not won these I could never afford them, but if you desire a multi-polar speaker for surround these are tough to beat.
Ed
* Sierra-2EX's W/V2 crossover upgrade
* (2) Rythmik F12's
* Parasound Halo P6
* Audio by Van Alstine DVA-M225 Monoblock Amps
* MiniDSP 2x4HD For Sub calibration
*World's Best Cables Canare 4S11 speaker cables