Is there a specialty food district that has boutique/imported fine foods or even local delicacies done to their best. (I am thinking something similar to Chelsea Market (since the OP referenced NYC))
Also, if not, how about at least an Italian Specialty food place with: Prosciutto di Parma, Gaeta olives, San Marzano tomoatoes, Reggiano Parmigiano (from Reggio area), fresh Mozzarelli di Bufalo? Just seems with the Italian heritage of Argentina these would be in demand, but i guess the import expense thing is a problem.
And thanks for this extensive list Ries et al.