I wish I could help out in this case, but I have very limited knowledge in this regard. You should ask Shyber. I believe he's got some good sound equipment, and should give you an informed opinion.
I'll just say that the expensive home theaters that Sony/Samsung sell at official stores are usually not worth the extra money. You could most likely get the same quality from a Pioneer, Philips, Yamaha, or Onkyo HTS. That is, unless you want a good blu-ray player in the deal. In such a case, the 5.1 Sony HTS wouldn't be such a bad deal.