caguide is right when he/she says it helps a lot to have an updated book
but i think help from locals to organize your trip is free.
anyway i understood you wanted to stay in Arg. the 6 weeks.
on a second reading i got you have to allocate time in diff. countries
i can make it short in Arg. if you please.
2 days in northeastern: iguazu
3 days northwestern: salta jujuy
a week in buenos aires
3 days in the lake district
3 days in ushuaia
it is not so bad.