Hello. I used to own that same NAD pre/power gear. It's brilliant and although I've moved on to gear selling for 3 times the price, the NAD gear is competitive with my system. When I was using the NAD equipment I used Chord Company Crimson for interconnects between and the pre and power and also for connecting my CDP to the preamp. The Crimson is Chords cheapest interconnect, but it has amazing synergy with the NAD gear. You will likely be amazed. The best and cheapest way to buy Chord Company cables is via the UK ebay site. Just google ebay UK. Many sellers will ship to the USA for just a few bucks. I have tried more expensive cables in the Chord line as well, but I love these Crimson cables.
The Chord Company is the UKs biggest hifi cable manufacturer and is very popular in the UK where people know hifi.
Good luck.