Canman, I would be inclined to suggest the M22s if you're going to use the SVS 25-31(incidentally, you can ask Tom at SVS to tune your 25-31 to 22hz, rather than 25, for a little more bass extension. They do this without additional charge). Bear in mind that there's no law that you have to use bookshelves for a "bookshelf" speaker. They can be placed on the floor and tilted back slightly. The key point in speaker placement is that the woofers should be at different distances from the three nearest room surfaces(i.e. floor, sidewall, frontwall).
