You are in reverse culture shock still. I think this quote sums it up best, "Buenos Aires is no longer cheap, it's affordable."
What people are complaining about is the prices compared to what they used to be. With 25% inflation, price increases are very apparent and the dollar exchange rate has not kept up. You'll notice it in a year too.
That being said, there are definite bargains to be had here. The menu ejecutivo (lunchtime menu) at many popular restaurants is MUCH cheaper than their nighttime menu. Sudestada and Benihana are two of my favorites for this, but there are plenty of others that do this too. Still, Benihana used to be $40-$45 pesos for lunch.
Most services tend to be cheaper here too. Maids are $15-$20 pesos a hour. We had a plumber come and it was $100 pesos. Like I said, the problem is that these prices keep rising.
A $55 peso haircut is definitely not a top salon. I pay $55 pesos for a man's haircut at an average place near me. 6 months ago that haircut was $45 pesos. Check out some other places and you'll see.
I completely disagree with you on groceries. While some items might be cheaper, the average is the same as the States. We easily pay $500 pesos per week for groceries (and we eat out/order in a lot). That used to be $400 pesos per week not so long ago.
I think you see the thread here. Earning in dollars is great, but the don't go as far as they used to.
Electronic: buy from MercadoLibre.com. If you're going to be here awhile, you'll learn to love that site.
A couple earning $10,000 pesos per month can live here, but they will be lower middle class, not upper middle class. Rent, car, private health insurance, going out, travel, etc. is just not possible with that income.
Foreigners are only allowed to sign 6 month leases by law and most standard residential leases here are 2 years. Having a visa will allow you to sign a 2 year lease, but will not help you out with the garantia. That requires owning another piece of property. $600 seems fair for a shared room. I'd think you could get a furnished 1-bedroom for around $1000.
Glad you like it here...