I am currently running SP-1s for mains, SC-1 for center and KSW-12. As for rears I have a pair of wharfedale bipoles which I am pleased with but not astounded with. Being that my receiver is 6.1 I am weighing my options. Optimally to stick with the synergy line I should get the SS-1s and another SC-1 for my rear center. But is that absolutely necessary? Could I get away with a pair of SS.5s for surrounds and a sc-5 for the rear center or will the difference be drastic? The price difference between the 2 options is over $200 but I dont want to make the mistake of saving $200 only to be disappointed. Third option which is unlikely is to purchase the matching wharfedale diamond center channel for the rear center (is it taboo to bring up purchasing other brands on this forum?) Do you think a difference in the brands will be that noticeable? Thanks for any advice that is given.