Help to choose one: Onkyo Vs Bos Ac Vs Polk audio

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Hello All,

I would like to buy a new Home theater system for the first time at the budget of 50K which should include speakers, receivers and two tall boy. We have a living room which is provisioned as 5.1(such that 4 speakers can be wall mounted and assumed two tall boy behind TV, one center speaker). I do not know how woofer would be beneficial.

I did some research and found certain URL's which I like to go but I was not able to end up to take a decision.

I have the choices as,

1. Onkyo-SKS-HT870-Theater-Speaker-System :

http://www.amazon.com/Onkyo-SKS-HT8...&keywords=home+theater+system#customerReviews

2.Harman-Kardon-BDS-7772

Amazon.com: Harman Kardon BDS 7772 5.1 Integrated 3D Blu-Ray Disc Home Theater System with Wireless Connectivity: Electronics

3. BA

SoundWare S Home Theater Speakers | Home Audio | Boston Acoustics US)

4. Polk Tl1600

TL1600 - Polk Audio

5. Polktl250

TL250 5-pack - Polk Audio

5. Polk tl 350

TL350 - Polk Audio

6. BA with Denon

http://www.amazon.com/Denon-DHT-E25...8&refRID=0HTXPZ0EBYM2RCARSAGE#customerReviews

Help to choose one or Suggest which one to go interms of sound quality. I am a guy who look for sound details in movies and songs.

I appreciate your help.