Studplayer question: Buenos Aires or Lima?
Well friend.., you have a good one here, to write a whole book. What do you like most: pussy or wine? I would say that Lima outbeats BA in pussy but is clearly a loser in wine. Let me not be oversimple: Lima is a Latinamerican city, without many "externalities" you´ll find in BA (Highways, transportation, communications). The climate is always humid and pretty cold, considering its tropical location, with a permanent haze that shades the sky the year long, even though never rains. On the other hand, Peruvian women are very friendly and the best lovers, not matters their appearance (sometimes a 7 can be a marvel). The prices are cheap, but will probably continue like that for a long period.
Buenos Aires is an European decadent city, like the ones in Eastern Europe, and you will find common threads with what you can find in Madrid or Prague. The food and drinking is outstanding and you wil miss little of the modern communications and goodies of a developed city. Prices are very cheap (perhaps slightly cheaper than Lima) but everybody percieves this as an artifact of devaluation and crisis, and rapid recovery of the economy is bringing the peso up, so I wouldn´t bet that BA will continue to be a cheap place. Climate is humid and hot in summer and never goes below freezing point in winter. In the pussy dept. I would say that Arg. women are much more beatiful and fancy, but they transmit (IMHO) that hidden feeling of "I give you this and you give me that" (quid pro quo) that is frequently absent in Peruvians an Brazilians.
Bottom line: You are relocating for a year or two, like a balanced pleasures life and cannot live without metro, highwys and good phones: Buenos Aires is a no-brainer.
You like adventures, accept some hints of uncertainty, like real women that want you (and your money) but makes you feel like a King, and besides you are going to stay for 3 or 4 years, even get a permanent girlfriend: consider Lima.
It´s a difficult decision, but at least bewteen two different types of paradise.
Addition: Go to BA and get a few Peruvian girlfriends