I also would recommend the Atoms. Excellent speaker for the size and price and would work well as a surround. Are you locked in to the 3's for your fronts? I think the monitor 5 is a better buy for the money.
thereallitefan - I'm also looking for fronts for a surround and am considering Paradigm. For my size of room (22 x13 x8), I thought the monitor 7's would work well. How would you compare them to the 5's? Have you compared them to comparable PSB speakers? And have you hear Axiom speakers?