power conditioner/power cable

I agree with the others; the amp should not be plugged into a conditioner; many owners manuals will say this. The other components should be plugged into a power conditioner or RF/EMI filter with surge protection.
A lot of info in the archives on power conditioners; some filter the AC, some regenerate clean power to the system.
As I said in other thread, it's a good idea to have your rig hooked up to it's own dedicated line and breaker.
As for PCs, most stock cables should be upgraded even if not using conditioning, but you need to find the right cable for your setup.

i would have to agree...

I use a Furman REF20i for all my analog stuff including my Bryston 4B-SST2 amp.
I use my PS Audio P600 for the digital stuff.
My power conditioners use aftermarket powercords.
The Furman uses a Pangea AC9SE and sounds better for it. The PS-Audio sounds best with just the regular Pangea AC9.
Opinions are free, and not worth too much except as general guidelines. To know what really is best for one's system, you have to experiment for yourself.
Somebody elses theory is worth squat compared to hearing it for yourself.

Cwby8115,

what are the other components in your system?
where are you located?

I agree with the above comments and will add that I recently bought a Blue Circle Thingee (its a power condition) and Shunyata's Venom 3 cord, and it does the job with great results.