I have had my Paradigm Atoms v.6 for about 2 months now, and I love them. Definitely worth an audition if you have a paradigm dealer near you. Mine were $299 for the pair. So, if you need a center as well, you could get three atoms for approx $450 USD. I have heard many people here recommending the same make and model for the center as you use for the fronts for better sound matching. It is also usually more affordable than buying a true center speaker (in most cases). Of course if you can't audition them first, then you won't know if you like them.
Good Luck!