Will power conditioning really help?

Been reading alot about SB2 etc and how having clean power really makes an impact on sound quality. Can someone go in depth for a newbie and explain why this is so? Do I just need a power conditioner or is there work to be done on the actual oulets and power system? How should I incoporate these benefits in my current system?

Totem Rainamakers
Nad c320bee
Modded SB2

P.S. Due to room constraints and lack of space I do have both my computer system and audio and t.v cable box. What can I do in this situation to improve power?

Thanks everyone.