DIY Power cables: quality wire?

I’m wanting to DIY a few power cables. I’ve looked around and with so much positive & negative information I’ve become to realize, I just want to use high quality wire, and it be very well shielded so that I can use in my system. 

I don’t want all of the super high end end plugs as I’m going to use the Sonar Quest ones. I don’t really want to make the cable other than just terminate it with the plugs. 

Can someone recommend to high quality bulk wire that highly shielded in 10guage and 12 gauge?

Also, I’m looking to terminate a couple of C7 end plugs, is there a place to buy those types of plugs?