40 feet balanced between preamp and Levinson....

My suggestion would be to watch the used side here and wait for a deal. I did, and bought a 35 foot pair of transparent UltraXL balanced for $800. I thought that I did pretty good! Long cables go through here all the time.

I would try CALLING the folks at LAT International and see what they can come up with for you. With that long of a run, you will encounter higher than normal series resistance and high frequency loss. While the balanced line will help to reduce this, i would recommend the use of a silver conductor. Not only is silver lower in resistance than copper, it's greater high frequency extension and tendency to increase system resolution may help to balance out the losses from such a long run. Not only are their prices pretty reasonable, you have an extended amount of time to try them out at home with no risk involved. Sean
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http://www.latinternational.com/

If you using ML you should deffenetely go for Transparent Audio or MIT. They are best working in long length.

I agree with Sean on this - LAT will be able to help you with a quality cable and good/fair price - I use them.

Go to the local electronic parts house and have them make up a pair. Bet it's a lot less than $800 (used!). According to the manufacturer of my Atma-Sphere pre-amp, it can drive lengths as long as 200 feet. Don't know about the Audio Research. You could ask 'em I bet.