Because my space is fairly simple (rectangular room, no large openings) and because it is small enough to more or less force me to mount speakers on the wall rather than set them on stands, the ADP's were preferable to the 20's. I've had them for over a year and a half now, and have been very pleased with them.

m-mmeyer offers a very good suggestion -- trying the ADP's out in your space. If you are already pleased with the 20's for surround, you may prefer keeping that arrangement and just adding the last 20 on the surround back. A good Paradigm dealer ought to be able to let you demo a pair of ADP's at home to see if you like them for surround.

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