So I just ordered the new Panasonic VT50 and want to get a real nice surround system to compliment it. I was originally looking at Panasonic's Full HD 3D Blu-ray Disc™ Home Theater SC-BTT490, but an employee at Video only told me that I would just be wasting money. He recommended either Yamaha or Onkyo (which I had never heard of). It just seems like there are so many options and I am having a difficult time deciding which system to get. I need a receiver as well as speakers. I would like to spend no more than $500-600 if I can. I was looking at the Onkyo HT S7409 or the HT S8409 Also, would you recommend a 5.1 system or 7.1? Do the additional two rear speakers make a huge difference? Thanks.