When I set up my system I went with Polk speakers. I bought two tower fronts, a center channel and then two di-pole side speakers for the surrounds. Mounted the two di-poles on the wall on either side of the primary sitting area. They do a great job on the surrounds. As I recall from my research it is harder to get excellent quality sound from concealed speakers than from free standing or wall mounted ones. Here is the system I ended up with:

Center Channel: http://www.polkaudio.com/homeaudio/products/individual/center/csi5/
Front Surrounds: http://www.polkaudio.com/homeaudio/products/individual/floorstanding/rti8/
Rear Surrounds: http://www.polkaudio.com/homeaudio/products/individual/surround/fxi5/

Head over to www.avsforum.com , lots of good info over there.