Last week I went through three days of nonsense in order to get a CDI to take out US dollars from BBVA Frances that I transferred to myself using Xoom. they had me running all over town, to Imigracion, to Anses and back again (no one seems to actually know where you need to go to make any transaction, but they will pretend like they do and you will retrace your steps over and over).
After much frustration I was able to get a CDI (you must go to the closet Police station to where you are staying and get a Certificado de Domicillio. I was staying at a friends house, so I gave them that address and my passport info and an officer came by the next day to confirm that I was staying there. Then, I took that Certificado to AFIP (Administración Federal de Ingresos Públicos) along with a photocopy of my passport-- there is an office in Palermo on Luis María Campos 112. You fill out one page of paperwork there and it is then a relatively quick process.
Feeling like I had finally succeeded I marched back into BBVA Frances and waited an hour to see one of the clerks at the desk. In addition to the CDI you will also need a numero fijo and the postal code for your domicillio. Por fin, she sent me to the caja to get my cash and the woman told me that I could NOT, under any circumstances take out DOLLARS (although there was a clearly posted sign in the lobby telling clients that they now had the option to take out dollars... i assume no one has bothered to take down the sign...??). she offered to give me my $500 US in pesos at the 'standard rate' of $4.48
I couldn't believe it. So much wasted time for nothing. I denied the pesos, cancelled my original transaction with Xoom, and made another transfer to be picked up in pesos. The Xoom rate of 5.5753 (or whatever it is now) is still better than the bank/ATM rate, and picking up the money at MORE was about the easiest thing ever. I didn't even need the CDI there, just my passport and confirmation number.
so, long story short. You cannot take out Dollars no matter what you do, so please don't waste your time. Wish i had been able to talk to someone with recent experience in this transaction because it would have saved me a lot of anger and unnecessary subte rides.
My advice is to bring as much cash in US Dollars as you are comfortable carrying and trading those on the black market (or 'dollar blue'). The going rate there is well over 6 right now....
hope this helps. good luck with your money woes.
XOOM in pesos is still the best option at this point and I will continue to take my money out this way...