once some items get grey, i find that the armor kits sell the best.
barbaric bracers bring in a good penny, but that involves getting the materials which you may not get from the zone you frequent now. so it would require you to go back and farm a little.
so whereever you are, whatever leather skins you get, the armor kits seem to be the best.
also, dont expect to place tons of them on AH at once..they sell well but not that well in my experience. if you have a mule sit in your city that has the AH, he can place them on the AH as needed to maximize coinage. i sell them normally in sets of 1s, 2s, and 4s, occasional 8s or 10s depending on how much is in stock.
the nightscape gear is pretty good but that's also an easy recipe for thick leather, so every leather worker at this stage will have plenty of them on the AH making it harder to sell yours.