Hank:
Really no way to tell how much it would cost. I had two circuits run with #10 THHN, and it was about $250. Of course, it wasn't that difficult either, so if you have a difficult run, it would be more money.
I use no power conditioning except for a Quantum Symphony, whihc is parallel, and mine is amazingly quiet. It helped out with the background noise, and things cleared up as a result.
HTH,
B