one of my real good knowledgeable specialties.
OK, for the money Yamaha is the best, each speaker has it's own independent amp, basically the Yamaha reciever has a big amp, but it's not bridged like every other brand, how ever many chanels the amp has that is how many individual amps there are inside the unit. That means each speaker gets it's own amp, which produces a more clarified sound. Also Yamaha has the best design as far tower speakers go, the coil system is not twisted like all others, it's sodered (sp?)
Bose is alright, they are good if you live in an apartment, other than that you can get much better for the same price or even less. Bose markets to older people who will never upgrade, and just want decent loud sound, but there 6.1 still needs a lot of touching up.
Sony sucks, you are paying for the name when you buy Sony, you might as well Technics, it's the same thing as Sony. Sony will give you top notch design, but as far as power goes and clarity Sony does not compare to Yamaha.
Put it this way, I worked in the Audio/Video department at Best Buy for like almost 2 years, and I got to see what gets returned the most as well as what works the best for sound, clarity, 5.1, 6.1, and now Lucas has 7.1 which will be here soon, and Yamaha is the only company embracing the challenge of 7.1 because they will make a way to bring it out.
My advice as an ex non commision sales rep from Best Buy go with Yamaha, that is the best bang for the buck.