I don't know Maximus.
I looked over his site, and his gear looks good, and the prices are not too high. They are also not so low as to be suspicious.
The fact that he makes good especially for the Dag market speaks well of it's suitability for dag combat.
His website has none of the "watch out" signs.
He has had two testimonials on this board, and he has given you two references.
These are all good signs.
In short, I am not sure that you would be able to find gear from an outsider for very much cheaper. Yes, you could find US made armor for a little cheaper, but Maximus' knowledge of the Dag ruleset leads me to recommend that you go with him, or with somebody like him, if you want to buy new armor.
The knowledge of the rule set is a big thing. In essence, by going with a dag specific armorer, you are not just getting armor, you are getting the benefit of his knowledge. The dag rule set has seemed a little particular to me, because I come from a different club. Don't discount the value of that knowledge.
This doesn't mean that you shouldn't shop around, or check the references that he gave you.
It does mean that I think you wont find a much better deal in new armor on the outside. This may be the standard for Dagorhir armor. I am not experienced enough with this group to have an informed opinion. The prices for new gear on his site are equal or cheaper than new gear where I come from. I will know why in a year, but I don't now.
I certainly think that you should check for used stuff that fits the bill. At your size and weight, however, it seems unlikely that there will be a lot.
And the suggestion to make your own is still a good one. Lots of folks will help you.