From what I understand, every piece of level 80 exotic armor you can find from crafting can also be found from a dungeon vendor. So if you saw a crafted piece with x allocation of stats, you would be able to find an armor piece with the same x allocation of stats from a dungeon vendor. The only differences between crafted, and dungeon is that they have different runes in them and different appearances.
Here's two crafted pieces from the TP:
Here's a chest piece from CoF dungeon:
(this piece has Superior Rune of Baelfire but I cropped it out and didn't want to make another picture).
Hm, karma gear might have their own unique stat allocation. The vendors are never up when I visit Orr though so I can only base this assumption on the one karma piece I own. I have a 72 Precision, 72 Toughness, 101 Healing Power chest piece from the Balth vendor but I can't find a similar set of stats on the TP or dungeon vendors. Regardless, you can still find other chest pieces with the same values of 363 armor, 72/72/101 numbers from crafted and dungeon.
Culturals aren't exotics so they don't have the same stats, AFAIK.
Cliffnotes version:
Any level 80 exotic crafted armor you find on TP, you should be able to find an armor with the same stats from dungeon vendor.
Karma gear might have a different set of stats but because the vendors depend on zergs to take out the bosses, I'm usually never around to see them.
Is there a set of exotic armor that you can get cheaply and right off the bat?
Used to be CoF armor; easy explorable path, you got gold at the same time as you were working towards your armor... it was a free set of level 80 exotic that came with a ton of gold provided you had the time and sanity to grind through the dungeon about 69 times but now that path is made harder and the experience and gold is nerfed so eh.
