After some consideration, I've decided to go with monopole surrounds, going forward. I'm starting to think about what precisely to get. So the question is, for an eventual 7.1 system, should I go with the 40's, or can I get away with the 20's? I would be very grateful if anybody can directly compare the performance of the 20's with the 40's. Are the 40's worth the extra dollars? For mains, I think the answer is an obvious yes, but for surrounds? The goal is music first, HT second. Either will be stand mounted to be sufficently high to fully clear the height of the sofa back in question, which will only be slightly higher than ear level. Will be used to complement 100's and CC. Thanks in advance, Martin.