Hi, I would definitely recommend that you bring as many of your favorite books (novels) as you can. There's an extremely limited number of books in English and I do mean extremely limited. There's no way to order books from abroad due to import/export laws. I've heard the current president is trying to change that but so far nothing has happened.
Bring your own Smartphone, laptops, tablets, MP3 players. If you can also bring your own power converter. You can buy them here but it's easier if you bring one with you. If you're planning on staying here long-term and you're into video games or are an avid DVD collector, fair warning, a lot of the stuff sold here is bootleg and won't play on players or game consoles from the States. I had this issue when I first moved here and it was a pain.
If you're planning on going to school in Argentina you'll need to have all of your transcripts and diplomas from high school and college notarized and apostilled before moving here. The Embassy will not provide them for you. Plus, these are very important if you're going to apply for work here. Of course you'll need to have the documents translated once you get here.
If you're considering Argentine residency, I recommend that you get an FBI background check done first. Then have it notarized and apostilled as well. If you're married, notarize and apostille your marriage license as well. We learned the hard way what a pain this could be.
Keep in mind that if you're over the age of 30, finding work here can be an obstacle. Argentina has no laws that prevent employers from discriminating against age or gender when looking for potential candidates.
If you have IT experience, you'll likely have a better chance of finding work. If you're from the States and are considering teaching English here, keep in mind that private institutions and universities teach British English and not American English and yes! There are subtle differences, particularly with the way words are pronounced. I tried giving a student who was studying at one of the language schools private lessons but I taught him American English and it really messed him up when it came time for him to take tests and things like that.
If you're bringing kids, keep in mind that the selection of toys sold here are very limited. You might see a range of Barbie dolls but not necessarily all of the accessories that we're used to seeing at Toys R Us. If a movie comes out (i.e. Power Rangers 2017) you'd expect to see a line-up of toys but that won't happen here unless it's Spiderman or Star Wars. Again, this is due to the import/export issues in Argentina.
I think I covered all of the essentials. Sorry if this is too wordy.