Speltz Anti-cable vs. Signal Cable Ultra vs.Clearv

Any thoughts on what the best speaker cable is for Legacy Audio Focus 20/20 & B&K monoblocks would be? The Speltz Anti-cable vs. Mapleshade'a Clearview Golden Helix or Double Helix vs. SignalCable's Ultra Speaker cables? Also, thoughts on better sound through speaker legnths over 8'??

Anxious to see your thoughts. Thanks.