Which set to get?

A personal preference here is on the Logitech 5.1 setup for the sound quality and features like a headphone jack, volume control, and power switch where you can reach it. The disadvantage of the newer Logitech set there is seen with the older Z-640 that has those controls on the center speaker rather then seen on the left or right speaker. You can have the left and right, front and rear pairs apart for the separation of channels. Makes surround just that.
http://www.techwarelabs.com/reviews/audio/logitech_z640/

z640pa5.jpg
The Z-640 of course is discontinued at this late date.
 
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