One of the more under-the-radar wineries you should be getting to know is Mendel Wines. They’re small but steadily gaining huge respect in the industry.
Their highest rated wine is the Finca Remota, which is $100 in the US, but Mendel Malbec is a good (and fairly widely distributed) choice in the $25 range.
In between is Mendel Unus, a delicious wine around $50 that got 93 points from Wine Enthusiast.