In Factions, armor crafters can be reached, in order of armor level: Shing Jea Monastery, Ran Musu Gardens, Seitung Harbor. There are also 5 collectors in Haiju Lagoon who will provide the same armor as the Seitung crafter for free, provided you manage to get all the required drops; which, depending on your luck, can be easy or very frustrating. Frankly, I usually prefer to spend 1k and get it from the Seitung crafter. And a tip: 2 Naga Pelts are more useful for a later Kaineng quest than for this armor.
Then there's of course the Kaineng Center crafters once you reach mainland, and some collectors there as well. And do not forget you can jump over to Nightfall (if you have it) and once you reach Consulate Docks there's a couple more armor models (provided you run one of the core professions ie. not A or Rt).
The quests on the way should provide you with enough money to get each armor set as you reach it. Max armor should be a little more effort but not outstanding. So I don't really see a reason to skip any armor crafter, because the game assumes you make use of them and the quests WILL escalate in difficulty every time the story takes you to a crafter outpost.
It's possible to do what chilly willy does and skip some sets, but IMHO that's masochism. It's 100g for Shing Jea armor and 375 for Ran Musu armor, plus 100 for a salvage kit to get mats, come on, is saving 600g worth the pain of doing the entire trip to Seitung in starter armor? Not to mention you get to try various armor models so once you go to buy your max you know what kind you want.
On a related note, regarding weapons: Seitung holds
three quartermasters with decent non-max weapons, and a weapon crafter, who offers 20/20 staffs for 750g, outstanding value for the money which is pretty much unique for a crafter, I think, in the entire GW world. Great one-stop shop for all your caster heroes and even your characters, since on a staff having 20/20 is much more useful than max damage.