Dear sirs, A few years ago I purchased an Onkyo TX-SR506 7.1 Channel Home Theatre Reciever, and a pair of MORDAUNT-SHORT AVANT 916i loudspeakers. I've been running these dual channel and wish to upgrade to at least 5:1 with the addition of two rear speakers and one woofer at least. Upgraing to 7:1 might be too much as my living room is not so large. Please give me your suggestions for the additional equipment. I normally visit Richer Sounds in Brighton to purchase. Include approximate prices please. Thanks in advance,DCF