What is your favorite line-level wire, single-ended & balanced?  Mismatching is OK.  Source & estimated cost would be helpful.  
Only 10" pigtails, no or minimum shielding is OK  
Hard-wired switchbox requirement: Moderately easy to bend (my favorite, twisted-pair AWG12 is way too stiff); conversely, must be moderately durable (no super-delicate easily broken).   
TIA!