Thanks you so much Inferno!!!! This is what I wanted to hear!!! Haha. You are right about me overcomplicating it. But this is what happens when you don't have knowledge about something.You really are complicating things you know? hahaha. I don't think anyone will try to tax you anything because even if you have new stuffs, they are for personal use, not to resell. Afip has a website.. let me paste it below: http://www.afip.gov.ar/turismo/
Now, in there it says:
"Argentinos que retornan al país luego de haber residido más de UN (1) año y menos de DOS (2) años en el exterior"
Efectos personales y del hogar, nuevos o usados, destinados al uso del beneficiario o de su grupo familiar: Importación libre de impuestos"
(in case you dont speak spanish, it basically says Argentinians that return to the country after living abroad between one year and less of two, personal efects, new or used, destinated to personal use or family group: import free of taxes. There is another entry for more than 2 years, same thing)
Now, I believe that in papers, you are an Argentinian, not a foreign citizen who got permanent residence. As your father is from Argentina, you are one too. So.. if you were living outside the country for more than one year, which you were, you can bring your personal items with you.
Just in case, print that page and show it to the officer if anyone looks for a bribe, but I don't believe anyone will expose like that.