Remember that ATM fees are high in Argentina . 90 peso transaction fee is the norm at almost every bank here . The maximum is 2,400 pesos per transaction on a foreign card . Sometime you can do two transactions per day - it depends on your bank as well.
There are rumors that the maximum transaction will increase shortly but no one know when.
Some drivers will take dollars but not everyone.
It is becoming possible to pay in some taxis with a credit card .
Premium one of the biggest radiotaxi companies now allows payment by card.