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