Really Long XLR

Another really high quality and very good sounding XLR is Belden's BAV line. They have the same basic tech. as the Iconoclast series but a lot less money and are much more flexible. I have used a 32' long set running between preamp and power amp with great success. Also they are hand made to order so any length you want is no problem.

 Markertek will make you whatever you want. Canare and Belden....

I went with Transparent and have a 70' run.  They work fantastic and having my speaker wire now down to 8' has substantially improved my system's performance.

Good luck and let us know how you make out!

Following on from the previous post, Transparent cable is quite good value in longer runs relative to a lot of quality audio cables. They can be even better value pre-owned as there is a small enough market for long interconnects.

+1 on mogami 2549 with neutrik..

I have found the belden 1800f quite on the bright side, not a bad character if you need it.

For such a lengthy xlr, depending on rf conditions perhaps starquad is a valid choice... Mogami 2534 or canare l4e6s for less.