What interconnects work best with Audio Research?

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.

Over the years, I have seen ARC products using AudioQuest wire frequently in shows and demonstrations, especially with Vandersteen speakers. The largest ARC dealer in the world for several years carried AQ almost exclusively and sold me on them. They are hard to describe other than transparent or neutral. If that is what you are after, give them a try.

The MIT ICs in my system seem to synergize best with the ARC tube pre-amp.

I did not like them as much prior using SS gear though they were still good.

I use Virtual Dynamics. Powerful cables with tube gear. They pass that warmth of the tubes right out into the room!