Gonna buy Kef surround system: Kef CI130QR/160QR for the in-ceiling speakers and then I need two floor standing and a centre speaker with a subwoofer. I cant quite work out which to go for, the Coda, Cresta or the Q Series. The flats quite small but I dont mind forking out a little more if the quality is better. 1. Whats the difference between the three series? 2. Theyre all sold quite cheap at Empire.co.uk but always wary of buying of the internet - please advise!