Looking at the already investigated Tubulus Concentus and Fidelium Cable, a 10' ft ( 3mtr) length is approx' $1300 - $1500.
With a Comfort Budget of $4K - $5K, does this suggest that the OP requires approx' 12mtr ( 36' ft ) lengths of the tried out Cable, or is there a want for a Cable that has a much increased price to ones tried out ?
I can only suggest a wire type for the purpose, bring PC Triple C.
This wire if Purchased as a SAEC 850 ( Stranded ) or as Acoustic Revive Ref II ( Solid Core ) will get you to a very attractive influence on the sound for approx' $600 - $900 if a 10mtr (30'ft) length is the requirement.
Those I know who have converted to PC Triple C have added to other interfaces in their system as well, and it is also becoming a Upgrade Wire used between Xover and Drivers on the owned Speakers.
PC Triple C Wire when used is discernible for creating a perception a Lucidity is present like not before, Space has Grown between imagery, Soundstage has been Inflated with a few more pumps of the good stuff.
When PC Triple C is being compared to other Wire Types that have been used. It can be said as the perception being created to myself. Other Cables once used, when reintroduced to the system sound bogged down with colouration and have a discernible loss for expressing freedom, the Cable seems to have drawn a Curtain in front of the speakers.