AVS Special Member
Join Date: Dec 2007
Location: Southern California
Mentioned: 16 Post(s)
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I have heard many systems using only 2 or 4 speakers that sound great.
A center speaker is preferred by some, but that is a matter of personal taste and system layout; it is certainly not necessary.
I suggest that you consider a pair of Polk R300 floorstanding speakers, which are only $200 per pair at Amazon, for your main speakers. I think these are better than the others you mentioned.
For the rear speakers, if you want something very small I would consider the Cambridge Minx 11 speakers. They come in black or white for $95/pair and perform very well for their size.
The main thing is to get speakers that do not have hugely different sensitivity ratings; rear speakers are not that critical in most respects.