From a purely engineering standpoint, a cable run as long as you have clearly warrants balanced cables. Very long runs are one of the primary reasons that pro audio gear uses balanced interconnects.
Whether it's "worth the money" is a question only you can answer...but please post your assessment after you install them. I'd be curious to know what differences you do notice.
Whether it's "worth the money" is a question only you can answer...but please post your assessment after you install them. I'd be curious to know what differences you do notice.