Go with either a Focus or better yet an Esprit. I'm assuming you would put the atom's on stands?? If you have no room for stands (using shelves?) get the Focus speakers - they sound much better than the atom for not much more money. Now if you can use stands or have "space", you should hear the Esprits, they are floor standing speakers but are no wider than the focus speakers. I had recently been using the Focus as my surrounds with the esprits as my fronts. For music (2-channel), they both sound great!!
Wait, I just read your post again.. It sounds like space is a big issue. Try the Focus speakers. Ther are approx. 2" wider and deeper than the atom's but produce far nicer sound.