Buying - forget buying in Argentina. You can maybe do it in Chile, but the process is involved and you'll spend a lot of time paying for life out there while you move the paperwork. You then have to sell at the other end - hard to see how it makes sense for a trip of at least 2-3 months minimum. Google it - people do this all the time with bikes - I can't imagine it's any different for cars.
Shipping - I met a few people who had shipped their cars with Grimaldi lines to Montevideo. Bear in mind that shipping is also highly involved - as you can't predict when the car will be with you you can also spend a fair amount on living while waiting.
Renting:
I used Baires rent a car in Buenos Aires for a day trip when I did my trip last year Baires - Inicio It did everything you'd expect from a rent a car... note their prices are in Argentinian pesos - which means if you come with US$ cash you can pay with black market pesos - not sure what the rates are these days.
For the sort of trip you're considering (just staying in Argentina most of the time) I think renting might be your best choice. But on the road time and money become interchangeable quantities and you haven't set a budget for either, so hard to say more....
Uspeh! (also a Bulgarian :-) )
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