Argentina is an excellent choice for your Spanish studying destination. It is a beautiful country with so much to explore, and what better place to start than in the center of it all...Buenos Aires! Check out these excellent schools that are popular with travellers for their low prices, experienced teachers and quality instruction:
http://www.minihostels.com/buenos-aires/language-schools.html

You can also try studying spanish in Buenos Aires at:

http://www.buenosaires54.com/english/learn_spanish_buenosaires.htm

Spanish School in Buenos Aires: We are more than just a Spanish language school in Argentina; our knowledgeable team of locals and expatriates offer high quality Spanish language immersion courses in Buenos Aires that are combined with a range of fun workshops, cultural activities, weekend excursions, 24-hour support, and accommodation options.