Hey foodiechic, I'm an absolute Argentine wine nut, having tasted and reviewed over 100 wines and visited about fifteen wineries. For the best winery to visit, I'd definitely recommend Achaval Ferrer. He makes probably the most "exclusive" and well-known Malbecs in the country (in fact, 3 of his 5 wines are icon-level Malbecs), but the reason to go isn't really for the tasting, since sometimes you might be stuck with a barrel tasting of a wine that isn't even finished yet. Instead, it's probably the most interesting and tourist friendly, with guides who give a ton of detail. My second winery recommendation would be Bressia, by far my favorite winery in the country. Every single one of its wines is amazing, and the winnery produces my favorite Argentine wine of all time, the Conjuro 2005. I never had the chance to visit the winery itself, but I've never had a bad experience with Bressia, and it just came out with its Ultima Hoja, the second most expensive Argentine wine ever, with only 800 bottles produced. If you want "the" wine in Argentina, that's probably the rarest and best to get. Finally, I'd recommend Familia Zuccardi, which is kind of off-the-beaten-track, but which is one of the biggest producers of Argentine wine in the country and probably has the most accessible wine tasting. You can even have a whole meal as an optional extra. In terms of restaurant, you MUST visit La Bourgogne, probably the best restaurant in the whole country. It's located right in the Vistalba winery, which doesn't have a great tasting but is an amazing place to dine at. I'd also recommend O'Fournier, which has probably the most elaborate wine pairing, pairing all levels of its wines with five different courses. Hope that helps!
