To whom at a higher price to sell ?? (Tom Clancy's The Division)

In general, they brought gold Kalash to the base, and they are exorbitant. And I just wasted everything, but I want to buy. In general, I trained nishtyaks from the dark zone and asked the question: And which of the merchants will most of all roll off the lave? Maybe it is better to sell weapons to a gunsmith, modifications to a modifier, and gear to a consummate? Or does it make no difference and you can shove everything off to someone else? Or maybe there is at which support point the merchant who takes the most profitable, tell me