power cables where do I start?

Every change will alter the sound somewhat, whether is better, or worth it, is up to you.
That being said, I would consider Zu Audio power cables. They sell older models on Ebay for a fraction of the original cost, and they are well built and perform just as good as more expensive cables.
B

Another vote for TWL and don't forget Cullen Cable if your budget is tight. 

+1 Cullen Cable for excellent affordable cables.

Cheers,

Scott

As I stated in the other thread, if you don't want to slog through it I just got a Furutech cord made for me by VH Audio. Furutech FP-S032N cable terminated with F-11 gold plated connectors for $402 burned in and shipped. It sounds outstanding Chris a pleasure to deal with, I can't recommend his company enough. Lots of different mix-n-match options available as well.

I used signal cable magic power on all my sources including preamp. Great price for a great power cable. Didn’t like it on my amp.