I try with astronomical price cable to make jumbers, but the advantages of the biwiring are unequaled.
Next step was to skip the binding posts and directly solder the x-over outputs with the separate cables.
Finaly I put the x-overs before the power amps.
I'm wondering why some manufactures have returning backwards to only 2 binding posts?
Today after a long lasting love with 3 Cardas models, I decide to settle to a fairly uncolored cable 'cause in many critical decisions that I've had, those lovely Cardas were cheaters and so my conclusions were faulty.
My present ref. cable is: VDH "Inspiration". It is fairly cheap ( 120 euro/m ) and inside the tube it has 2 blue & 2 red runs and although it is recommended to strip the 2 pairs together, you can use them temporarily as biwire until your budget allows for a second pair.
Also I strongly suggest you to skip the binding posts & hardwire direct with silver solder. At the amplifier side you can enhance the connection with Walker Audio E-SST.
Another point of concern is the internal wiring (mostly low level). There you must proceed with the same cable idealy.