Interesting you say that about Nordost cables . I use Nordost Heimdall ics and scs in my current system to good effect . Works well with my current fairly laidback speakers . But , I have heard they dont go too well with the utopias . Will be getting the Scala V2s in a few weeks time . Cant wait !
I found this link which explains cable impedence and resistance well .
http://www.roger-russell.com/wire.htm#alllowcost