Is there an affordable long run XLR preamp to amp cable out there?

Van den Hull. That's what Pink Floyd used when they finally figured out that cables mattered. Don't know what model.
Atma-Sphere and BAT opinions are of little value unless you use their equipment.
But if you decide to try a pro cable also give DiMarzio a try. Yngwie Malmsteen uses it with his guitars. I tried RCAs only not XLR - OK but nothing special, ridiculously inadequate compared to some Purist and Tchernov that I have.

If my recollection is correct, Chesky Audio used to use Nirvana top model cables. And those few Chesky cds that I have do sound quite good. Those primitive pro cables, among other things, do not deal with the matter of vibration caused by the propagating signal. Poor cabling is one reason for poor recordings, balanced or not. But if your active components are not good enough, yeah, get that Mogami or Canare for $50/1000 feet and be happy that you saved a lot.