Best advice. Go to a major bank, if possible their central office and do it. DO not risk bringing that money in in any other way, it will cause problems when buying, problems with Afip, etc. You are an Arg citizen. It is the safest and cheapest.You should seriously consider flying out here first, getting your Argentine papers in order, opening a bank account here. And then just doing a wire transfer.
This will be the best rates, and probably well worth the extra effort, assuming everything is above board, and also assuming you don't have pressing time constraints to first get your papers in order.
Also, for your price range of property, you may have a significant portion of sellers who have accounts outside of Argentina. In which case being able to do a deal where payment is made in full or in part through external accounts, becomes not only a negotiating element for you, but is a win-win in any case.