Being new to HT, I am trying to evaluate whether or not to spend the xtra money on rear effects speakers. Purchased the Denon 3802 and PSB 4T's, 8C, and 10S's. Purchasing in the next couple of weeks my SVS 20-39 sub. My room is almost square - 15'x17'. Currently, I have my 10S's slotted to be placed on the side walls almost directly above the main listening area. I have a back wall that would be ideal for two 1B's. How much added sound can I expect from them in this type of setup. The 10S's are dipole and did an excellent job of filling the listening area when I listened to them at the store. Unfortunately, the store did not have 1B's in stock to add to the equation. For the extra $200, will I get my moneys worth out of them since there really aren't too many applications for 6.1 let alone 7.1 at this time? Thanks for the help!