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/
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http://www.latinternational.com/