When I left my last official job in the US in 2006, I maintained health coverage for me and my partner under COBRA for a year. The cost was then USD 880/month, plus co-pays, deductibles, and limits of coverage. No dental or optical care, and limited drug benefits. Friends tell me that the cost of equivalent coverage there (New York City) has risen to over USD 1000/month for a couple in their 50s.
After reviewing a number of plans here, we chose OSDE 310, and we've been very happy with it. At ARS 740/month for each of us (1480 total), it's not cheap, but it covers everything, and our experience with the private medical system here has been extremely positive.
For the equivalent of USD 385/month, we have access to the best physicians, diagnostic facilities, and hospitals on the South American continent. My doctor has ordered tests and treatments that would take weeks to schedule in the US and would require substantial co-pays, but were done here in a day or two, at no out-of-pocket cost. When my appendix burst one weekend last summer, I received care at a level I can't imagine in the US.
It's very hard to compare health care systems between the US and Argentina. The Argentine public health system provides care at no cost for everyone - something simply not available in the US. It's been underfunded for at least 40 years, and the facilities are outdated, but by all reports the staffs are excellent, at least here in the capital, and they do a very good job.
For those of us who can afford it - at least for now jaja - there is the private, for-profit health care system that's superior to anything generally available in the US.
I say "generally available," because there are specialty facilities for the very wealthy at some top-notch hospitals in the US that possibly provide comparable, perhaps even more excellent care. But these are accessible by only the top 0.5% of US wage earners, which never included me, so I have no personal experience to compare.