Im thinking of upgrading my rears! i currently have klipsch s20's! Everything else is klipsch reference series! (rb 61ii, rc52ii,sw112, sr5006) i really want the rb 81ii but everyone says i will not see a difference. I tried the ks20 and dont see any advantage in the theory behind the speaker, ive always like the sound of bookshelf speakers better. So which is the better move with what i currently have another set of rb 61 ii for the rears or move the current set of rb61 ii to the rear and add the rb 81 ii. (i dont have room for towers)