I upgraded the audio in my small home theatre this year. I went with the Outlaw Audio Model 950/7100 combo and the M&K 750 MKII THX Select Speaker System. I bought my speakers over the Internet from Downtown Audio for under $2000 and they are great.

M&K Certified THX Speaker Systems
http://www.mksound.com/thx_sys.html

History of M&K
http://www.mksound.com/pdf/ken_and_company/history.pdf

Cheapest place I know for purchasing M&K speakers is Downtown Audio where you can purchase the 750 MKII THX Select Speaker System for under $2000.
http://www.downtownaudio.com/mksound.html

-------------------------------------
750 MKII THX Select Speaker System Reviews

Audio Video Review:
Presence, dynamics and a sense of cohesive accuracy are the core attributes of this AV speaker system. Add a delicate sense of detail, smooth tonality and overall approachability to that equation, and you have a winning set-up. Need lots of oomph and a quality source signal to prove their full potential, though
http://www.extraordinaryav.co.za/M&Ksep2000.htm

Yanman Review:
Speakers are the most subjective of any piece of a Home Theater setup, what one person likes another may hate. The best tip of course is to listen to the speakers first, preferably in your environment, and then make your decision. If you are planning on setting up a THX theater in a room of less then 2000 cubic feet, put the M&K 750THX Select Speaker System at the top of your list, everything else will have a hard time competing. "THX, the audience is listening..."
http://www.yanman.com/HomeTheater/Reviews/Hardware/MK750THX.htm


Good luck with whatever you choose !