Just to give you another option, yukon, that last one you posted can also be found at www.nrsworld.com
for less money.
Aztec, I would think that you could make your own very similar to that much cheaper. I would personally go with something a little harder like a rawhide bosal for the initial training stages. It may just be the horses that I ride but in my experience, even an incredible amount of groundwork and preparation won't stop some horses from deciding to buck and if they do, you need something that has a little bit of bite that can get their attention. IMHO, you just can't get that in a rope halter, plus, a halter lacks any kind of finesse at all for the more detailed training.