While GoldenEmbers ovens were not on your potential list, just in case you stumble upon them on the web and are tempted, in my opinion you should steer very clear of that company.
I, like you, decided a few years ago that I would give myself a treat and buy a wood burning oven for outdoors. With limited time and skills, I tried to find an oven that came "complete", and the Golden Embers web site caught my eye. Without boring anyone with all the ugly details, it was a huge mistake on my part---I even wire transfered the full purchase price to Australia (where Golden Embers is located) to pre-pay the oven.
If I had it to do again, I would go with one of the company's you have identified, each of whom has, I believe, a terrific reputation.
In any event, in my opinion, anyone considering doing business with Golden Embers would be inviting a very large headache. (In case anyone is wondering, I have zero interest in any maker of ovens, but I have been sufficiently burned by Golden Embers that, when an occassion arises, I try and pass along my own experience so that others can avoid the possibility of the same fate.)
Good luck with what should be a fun process