Im sorry but I don't understand... what does probably mean...? Why would you not want to use Xoom or another alternate solution that would save you money...?

To get the best information, you need to provide us with a little more insight as to what you want to do while in Buenos Aires. Will you be doing the hostel and B&B scene, or do you want to have international 5 star accomodations...? Fine Wine & High end dining or cafeteria style....? Shopping or not...?

Overly generic questions do not help us in helping you.