To my ears, the 40s will easily best the 7s. Not in the bass category for sure, but the clarity is a definite step up. 60s and 40s sound pretty much the same (identical drivers), except the 60s have more bass extension. With a decent sub, the 40s have enough bass that the 60s don't have much advantage. Size? 60s are about the same size as 7s?? You will then also want to move to the matching CC470 center if you are going to do multichannel music (if this isn't 2ch) and for the best movie presentation.