You can't buy those things over here. Not unless it's used or someone brings a couple from the US/Europe when they go for vacation or business. Customs here are almost shut down, you cannot import anything if you are not an importer or have a special permission to do so. I read about those portable amps... specialy for my ipod and the headphones, which sound a little quiet and I have to put the volume at max with the little apple shit. But I could only find an used Fiio e11, and despite being at $60 dollars amp for a brand new one, here it's equivalent to around $100 dollars... and it's used .
I know we're not the worst country to buy tech stuff, but somethings just go beyond stupidity, like the "new" [over here] GTX 780 that is priced at around $1200 US Dollars... I hope you get the idea
Anyway, that's why I was thinking in going for the DX, but it's not something i wanna buy just for the sake of buying something. A soundcard was something that was struggling in my head for a long time, and recently I heard so many times to Linus saying that It's a mayor improvement from the onboard audio, it's day and night, etc. But I don't know if I want to spend $900 Pesos (140 us dollars) just to hear a minor improvement... if it is something at all.
Oh, btw... what I've already spent in my rig, I might as well have bought a really nice bike