The Athena B1 is a much better speaker than the Polk T15. Used to own two complete sets of Athena speakers.
Saw these on Ebay.
http://www.ebay.com/itm/Pair-Athena-Technologies-Audition-Series-AS-B1-1-Bookshelf-Monitors-Speakers-/161242823683?pt=Speakers_Subwoofers&hash=item258ad23c03#shpCntId
If you want something smaller for your surrounds then get the s.5 speakers.
http://www.ebay.com/itm/Athena-S-5-Main-Stereo-Speakers-/161236260680?pt=Speakers_Subwoofers&hash=item258a6e1748
What receiver do you have?
Which Paradigm center are you using? An Athena center would probably be a better match.
Saw these on Ebay.
http://www.ebay.com/itm/Pair-Athena-Technologies-Audition-Series-AS-B1-1-Bookshelf-Monitors-Speakers-/161242823683?pt=Speakers_Subwoofers&hash=item258ad23c03#shpCntId
If you want something smaller for your surrounds then get the s.5 speakers.
http://www.ebay.com/itm/Athena-S-5-Main-Stereo-Speakers-/161236260680?pt=Speakers_Subwoofers&hash=item258a6e1748
What receiver do you have?
Which Paradigm center are you using? An Athena center would probably be a better match.