http://www.aperionaudio.com/product/Aperion-HP-51-Surround-Cable-Kit,46,39,149.aspx

That would be all you need to get a complete 5.1 kit going strong. If you just want the bare neccesities to get your speakers singing, then you need only the speaker wire, and a subwoofer cable.

http://www.aperionaudio.com/product/Aperion-HP-Subwoofer-Cable-5-meter,51,39,154.aspx

http://www.aperionaudio.com/product/Aperion-High-Performance-Speaker-Wire-100-feet,48,39,151.aspx

Hope that helps!