I suggest you inquire at the Argentine consulate in yuor country as to whether or not you can apply for premanet residency there.
Also ask the cost of applying there as well as what documents are required, regardless of where you start the process. if that's what you decide to do.
As far as I know, based on many posts here, you do not have to have legal residency (as far as migraciones is concerned) or two years of "physical residency" (as far as citizenship is concerned) to apply for citizenship if you are married to an Argentine.
If that is correct, you can bypass migraciones completely and apply for citizenship on your own (and without a lawyer) as soon as you arrive in Argentina.
If you can apply for citizenship based on marriage and that exempts you from the two year "residency" requirment for citizenship, I can't imagine why you would want to go to the trouble to apply for permanent residency, especially if citizenship can be obtained in a matter of months as opposed to "several" years.