Surround Sound Recommendation

A friend wants to buy her sister a surround sound system and is looking for suggestions. Requirements are that it has to be available from a Best Buy, Circuit City or Tweeters, price wise we are talking middle of the road (moderate).

I am a 2 channel junkie only so I would appreciate any help as to what brand and models to look for from these mass marketers. Any good complete package systems out there?

Thnx,