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.
Why not use the 20's all the way around? If that is too much money, try the cheaper, but not lesser, paradigm mini monitor.
I agree with S7horton; your best bet will be to maintain the same manufacturer's speakers all around.
Agree with both posters that sticking to the same manufacturer is your best bet. Mixing speakers in your setup could mean excellent sound or a disaster in terms of matching, the risks are high, unless you are some sort of a daredevil who wants to experiment and not regret loosing money in the process (buying, then selling and again buying)!

Studio 20 are not a very difficult load and your Denon will cope well with Studio 's20 all around. You could also consider the excellent subwoofers that Paradigm makes at a later stage.