That would be my website ; ) Link will appear below my sig.
I would say that the capra is usually the most calm but that isn't always guaranteed. Some capra are just as feisty and flighty as the armata. Most lepidogaster are also feisty but their bite isn't as strong as either capra or armata as they are much smaller. But then some lepidogaster are fairly calm, but they are the exception not the rule.
So, I would have to say that your best shot would be a capra. Even best would be a baby that you could handle frequently enough that it would get used to you so that it would not get flighty and would remain calm from the getgo.
Do check out my site and you may gain some insight on the species.
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Marcia - FroggieB Dragons
www.froggieb.com/MHDHome.html