I too have a pair of Paradigm 100's, CC, and ADP surrounds. About a year ago, I purchased three individual 15ft. runs (Front L, Center & Front R)of Kimber 4TC/8TC wire in a shotgun setup with postermaster spades. Keep in mind, I had this work performed by Kimber at the Kimber factory. I also paid a few extra dollars to have these three cables placed in a black sleeve to give them a more pleasing appearance. In essesnce these two seperate stands of 4TC/8TC cable appear to be one strand of cable from the outside. Although this may not improve the sound of your system, it does however make your system setup look much more presentable and refined.
As for the sound, like the post above says, I immediately noticed an increase in bass response. Likewise, once the cables were broken in, the treble and mid-range soundstage seemed to open up. I found myself auditioning some of my older CDs just to hear them played through my new speaker cables. After all, it that not why we choose to upgrade our components/cables? To fall in love once again with the music and/or movies of our choice?
If this is something you are seriously considering, I would suggest that you get in contact with an Audiogon member by the member name of "Disco." He is an excellent salesmen and knows his cables. If you choose the 4TC/8TC setup I hope you are as happy with them as I have been with mine.
Cheers and happy listening.