Pampita Adorhain is quite fine but I have noticed I don't think she is a white hot as most other guys. As for pics, here are some of the popular girls in the Federated Provinces:
Julieta Prandi ('La nena', or 'little girl', on the Francella Show)
Carolina Del Bianco
Dana Otero (The Vendimia Wine Queen in Mendoza, those from the area will understand... she's only 20!)
On a personal note:
Carol Castro in the action flick 'Peligrosa Obsession'. She was hot in the movie though she is (generously on my part), average looking overall.
As for particular provinces, from the experience I've gathered talking to people the prettiest girls in this country are in the provinces of Santa Fé, Mendoza, Córdoba (these three have urban and country chicks), and in La Pampa and the west and south parts of the province of Buenos Aires, if you want exclusively very cute country girls. Capital Federal has gorgeous chicks, but they are big city glamour and high maintenance. Other notables are the provinces of Misiones, Chaco, Salta (if you like more 'latin' looks), and Neuquén.
Locations: obviously the malls, as Chico mentioned, are good spotting places. And pubs, nightclubs, etc, as well as leisure and sports clubs (highly recomended!). City parks during the week when high school and college girls are roaming about.