Shunyata or Synergistic for power conditioning?

lak is correct. That's the only way to do it. If you live in the US, call The Cable Company. They can send you demo's of both units. 

" How does the Silver Ghost compare to the Cerious cords?"

The problem with power products in general, is that results are not consistent. Its hard to predict what a PC will sound like from system to system. If you can't use Cable Company and have no way to demo, you may want to consider JPS Labs Digital AC for entry to mid level digital components, and either ESP Essence or Richard Grey PC's. I've used both the ESP and RGPC with hundreds of components over the years, and never had a situation where they did damage. The JPS is designed to deal with some of the issues that arise low to mid cost digital components.