As title really, I have two surround bipole speakers on the rear wall either side of the settee. Would like to add another 1 or 2 speakers. Options are 1) a normal speaker behind the sofa ala 6.1 or option 2) an extra two bipoles on the side walls and finally 3) two normal speakers on the side walls. Mainly movies on this system not really concerned with SACD etc. Any advice from people with any of the above systems welcomed what they use it for and any improvements of the one over the other.