Out of thw ones you listed i would go with the herpstat. Me personally i like helixs. The ability to run one unit as 4 is a nice feature with the herpstat but if that unit fails then all 4 fail. I use 2 helix on each of my freedom breeders. 1 for each set of 5 in the stack. I like to know if i blow a fuse its only affecting one zone.