I found out that there's no way for Schiit in México (for example the schiit stack magni+modi cost $400 even from the store) with my budget of $100-$150,so I found better deals at china and Ebay with this ones:
-FX audio X6 (dac/amp)
-Bravo Audio V1/V2/V3/Ocean/S1
-or even SMSL M3 (dac/amp)
Since my Onboard audio already handles 192khz/24bits I´m planning to get a good amp first since I bearly hear something while gaming with the 6XX, so I need to kill everything with EQ without a good amp. Some forums says that 240 mW per channel or more is the ideal for the 6XX.
ps: Massdrop does not send drops to México.
EDIT: I have decided to go JDS Labs Atom amp.