What interconnects work best with Audio Research?

Buy a used pair of Cardas Golden Cross. They worked well with my Audio Research preamp. They will provide good soundstage and detail are somewhat cooler than the Cardas Cross which I think you would find to be too warm.

Most AR stuff needs something warm and a bit colored so I agree with the MIT,Cardas Golden,Transparent.
Stay away from some of the revealing cables Stealth,Nordost,etc as they will enhance the leaness and congestion in some AR stuff

I'm using Synergistic Resolution Reference X XLR's between my dac and VT-100mkII. Wonderfully transparent and open!!

I agree with the MIT suggestion for ARC but I do not consider them (at least the "terminator" serires that I use) to be warm sounding at all nor particularly colored in any special way.

VAN DEN HUL