My opinion is that the Paradigm Titans are better sounding than the Atoms, and only a few bucks more. The Atoms, while possibly having a flatter frequency response, have very little bass response. (I.e. almost none really).
I prefer the Titans because they have at least "some" bass response, especially at low listening levels.
(Some people have stated that the Titans can sound a little "boomy", but at that level, I would rather have a little more LF response, than none at all. IMHO.)
I would therefore recommend the Titans for a secondary system. (I use them in my bedroom, and they sound pretty good.)
I have not heard the others on your list, but I have read that the Epos are supposedly pretty good.
Good Luck in your search!