I was just wondering what people's opinions on the Q and Reference series were for KEF speakers. I'm considering buying a stereo pair with the possibility of building it into a surround system in the future. Room size won't be very large, just a basic living room. The Q900's have been well recieved and are in my price range, but from what I understand, the Reference series is a huge step up. That being said, the R900s are a bit out of my budget, so I would have to go with something like the R500s. Am I going to notice much of a difference between the Q900s and R500s aside from decibal levels?