I've no idea if BA is really that much more expensive than the rest of Argentina, as I have never bothered to venture too far east, I tend to get spoked if I can not see the mountains in the horizon!!!

But about the money, I have managed to live since February on $3500 in Mendoza. I haven't taken language classes, as I already speak well, but this amount does include two weeks travel for two people to Patagonia, the odd trip out of town, two days car rental and usually one nice meal for two in a restaurant per week.

I could easily have spent less, I am constantly amazed at the amount I waste! Just remember to buy your groceries at the local fruit stand and not at Carrefour. Its cheaper, tastes better and the money actually goes to somebody who needs it!