I bought him the black link one and (due to smaller links as well as color) it has the added benefit of blending into his fur so that when we are out and about I don't get dirty looks from passer's by who can see the links. Be sure to get a prong leash as well. Clips to both the prong and to the flat collar as a backup. They have super nice leather ones or a cheaper option...I forget what it's made of but kinda looks like black rubber. I got the cheaper one and it's worked out just fine.
I have the black H.S also but obviously in the 3.2mm.
I use a carabinier and attach it to the O link on the prong and the D link on the flat collar.
I live in UK and the shipping from Leerburg to here is expensive.
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