power cables where do I start?


I want to see what a power cable(s) can do for my modest system.

I just dont know where to start as a brand or component.

Suggestions please.

Will look for used. Will be budget minded. 

Current system:
Rouge 99 preamp
Odyssey Stratos mono amps
Vandersteen 2ce with vander subs
Rega cd and Rega Dac
Rega RP1
Hero interconnects
mswobo
To the original question, I would start with ...:
1) DAC
2) Pre-Amp
3) Amp
4) Transport or CD Player 
5) Turntable and/or Turntable Pre-Amp  
6) Power re-generator or conditioner  ( Yeah did that one also ) 

..and I agree with gdnrbob and went with ZU Mission cables. 
+1 on the Signal Cable Magic PC's being an decent, inexpensive upgrade from stock and being a reputable dealer. I've owned them for years and am just now looking to upgrade from there, starting with the dac.

+1 on the post from lak also.
I purchased a used Kimber PK 10....I was going to put it on my preamp as my dac is not used extensively....

Will go to dac after this experiment. 

really appreciate all the responses...forums like this get the ideas out there.....keeps us all informed
I forgot to mention PS Audio. They also have some older models that aren't cost prohibitive, though they are quite bulky.
B