This is what you are looking for
posted by Sebastian Velez in Argentina forum
http://www.aduanaargentina.com/b_lr.php
Check the link and you will have all the information you need.
The key is this part where says: La aduana solamente admitirá como equipaje a los efectos nuevos o usados que normalmente se pudieran utilizar durante el viaje para vestirse, asearse y para las necesidades personales (1) y de iguales elementos o de otros que en el país los utilizará para uso personal o para ser obsequiados, siempre que su cantidad, naturaleza, variedad o valor no presuma finalidad comercial.
But I can't find the details about how to prove that you are coming with only things for personal use.
I looked for some company for you and I found this one: http://www.mercovan.com.ar/Check it and let me know if it's useful for you. Make sure they answer all your questions.
Kind regards,
Seba