I've returned from my trip to Argentina. I'll try to not to repeat too much of what Vivago has already said. But here are some things i've learnt:
Using seeking arrangements is definitely the best way forward to get girls.
Prices in Buenos Aires can vary, had negotiated 3500 pesos (ARS) for a 3-4 hour session with an 19yo girl to 8000 ARS for an hour. It's around 48-50 Pesos (ARS) vs £1. Angelica as an example, had her on two occasions and paid $100 for four hours and then $150 for the entire night, around 10 hours. Girls tend to negotiate in ARS but i found that they prefer USD given the volatility of the ARS. The value here is very good, on par to Colombia in my opinion. Poles apart to the £150 to £400 an hour you would pay here for a washed up, jumped up "pornstar" or over-weight ugly lump here.
Girls are much more European than Latino. The quality and choice of girls available, even civvies, is a lot better than in the UK. I write this last comment, sighing at the quality of girls available on AW - it's been in decline for years now. Expect to find Colombians, Brazilians, Chileans and Venezuelans here too.
I saw three girls in total - should have been more but schedules weren't aligned. All three loved giving blowjobs and i found that girls here love being licked out: the more you give it to them, the more that they reward you. 2 of the 3 were expert swallowers and one loved anal. I did find that a lot of girls on SA were keen swallowers and a few were keen on anal.
Nightlife, bars, restaurants and general day to day life is good, cheap and varied. Especially steak, expect to pay about £13 for a 750g t-bone.
I stayed in the Soho area of Palermo (nothing like the Soho in London) and would recommend staying in this area.
Overall, Buenos Aires is a great city to visit. Lots to see and do. And the girls here are great.