DIY Outlet Box-Help with wire choices

I am building an outlet extension box which will use 2 Shunyata outlets and a furutech IEC inlet, all put inside a nice aluminum box. I will be plugging this into my Shunyata Hydra4 to extend the amount of outlets for the system.

I am looking for suggestions on 12 gauge solid core wire (copper or silver) to use internally. Can someone steer me to the correct web site and offer their thoughts?
I started with plain romex 12 gauge - then switched to DH Labs 12 gauge stranded (from a piece of their power cable) - the improvements were quite noticeable even with the short lengths of 5-10 inches.

I use small copper spades or spring clip termination on all joints/switches, which increases the surface area of the joint which appears to provide better transient response.

I also use a bus-bar approach rather than runing the wire from outlet to outlet. (See my system for a schematic)

Net effect is that I cannot tell the difference whether the sources are plugged directly into the wall outlet or the power distribution box

I use 10 gauge Furutech into the power distribution box and 13 gauge Furutech from there to the souce components - amp is direct to the wall outlet with a 10 gauge Furutech cable

All mains connectors are silver plated copper and I use Pass and Seymour MRI outlets in the distribution box and wall outlets.

Not really an answer to your question, just another approach :-)
Hi Stereo5.Silver is the way to go & see if you can get 12gauge stranded, much easier to work with. Good Luck
eBay. search for 'mil spec 12 teflon'
You will come up with a variety of Mil spec siver plated 12 gauge teflon coated 600V wire.
Not as cheap as it used to be. but this is the wire to use.
The never have full spools anymore. Just the short 10 ft 20 ft lengths for sale.

When I bought my 600+ ft spool i sure wish I would have bought three or four of them.
I used all mine up making a set of dual quad twist AC wires to run from my kitchen to my stereo.
I agree with Willie, get some DH Labs Power Plus, great affordable cable.
Is it possible to acquire the same wire that Shunyata uses?
This would provide a consistancy, since you are essentially "daisy-chaining" from your Hydra4, at least that is how I understand your question.
I agree with Elizabeth. I have had many, many power cords including Shunyata.
The Mil spec silver plated 12 gauge teflon coated 600V wire is great. That's what I am using in my DIY distribution boxes, check out my system pictures.
Slightly off topic, but can someone recommend a good source for the aluminum box to house the outlets?
This site has some nice boxes