What interconnects work best with Audio Research?

Then get yourself Cardas or Kubala Sosna wires. They are both on the warm side and have a lot of texture.

Agree, CARDAS is the brand for you. Be extra carful about used Cardas.. they have had a problem with fakes! Make certain you buy from a retail seller, or (used) from folks who have a long and solid reputation who are 'original owners' and can proove it.
(Few other cables have the 'look perfect'forgery problem Cardas has)

Thanks, which of the Cardas line up should I use.......

Also consider Harmonic Technology Magic IC and Pro-9 speaker cable.
These no-nonsense cables sound wonderful and are resonably priced on the used market.
I've used HT with ARC, BAT, Parasound etc. and have never been disappointed or felt like "something was missing".

I used Audio Magic cables accross the board with my reference Audio Research set-up and it worked great. The Audio Magic line-up is similar to the 'silver litz' cables that Audio Research use to sell except that they are updated and more refined.