recommendations for Paradigm Studio 20 V2

I just recently ran across a deal that I couldn't pass up on a brand new pair of Paradigm Reference Studio 20s V2. I'm in the process of building a new system (speakers, that is) and I would like some advice on what might sound good for the center as well as the rears to go with the studio 20 in the front. I have concidered the Paradigm Reference series, but I want to make sure that I’m not passing on something else. For reference, I have a Denon AVR2803 receiver and a Denon DVD2800 DVD player. I really don't want to spend an arm and a leg for additional speakers, however, I want them to be equal in quality and sound to the Studio 20s.

Thanks in advance for any and all advice.