I would probably go Beta 50, due to the matching center channel being better than with the other 2 choices. You get a 3 way center in the Beta line, which should outperform the the 2 way offerings from Polk and Klipsch. I was never completely satified with my 70's and CS2 up front. The 70's have great output for movies and music, but seemed very colored and mushy.
What ever your choice, I would recommend going ID for your sub, much better bang for the buck and my experience with eD customer service has been 2nd to none. The Polk, Klipsch or Infinity subs, just can't compete at the price point.
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