Try Otro Mundo , its an artisan beer from Salta / the Strong Red Ale reminds me of some old European IPAs. They also do a brown ale and a mainstream lager / they tend to be higher strength than normal
You can buy it in Jumbo and Coto / expect to pay between 9 and 10 for a 33cl
They used to do a 50cl , which was great bottle to share with a friend , but I think this has been discontinued
It is hard enough to find an IPA, much less a good one. The last one I tried was at a new, small restaurant/bar/cafe in Belgrano (or at least I call it Belgrano). It is on the street Elcano, about 10 blocks from Cabildo/Juramento going left if you are coming from Palermo. The new local is called Cervelar; it is kiddy corner from the Carrefour there. They have the largest selection of Argentine micro-brews I have yet to find; they also have really good hamburgers. If you are going to buy by the bottle, give the bottom a quick check to make sure the yeast hasnt settled. Its not that the beer isnt good, it is just that they dont sell it quick enough.
FIRST: In general, beer in Argentina sucks. But there are exceptions.
SECOND: Some good beer produced in this country is made for export only, because the breweries can't afford the taxes that they would need to pay to bring their beers to Buenos Aires. (Not making this up, heard it from a couple of horses' mouths at expos at La Rural.)
THIRD: The best English Ale. Not an IPA, but an English ale is:
KUNSTMANN (from Chile):
Available in DISCO and a few other places.
IPA from the Gülmen Brewery:
Their main logo looks like this=>
That's about it. I've tasted other IPA's at expos that tasted like watered down regular ales. What the general palate in this country doesn't taint, the central government tries to keep down.
Also, these beers will cost TWICE what a comparable beer would cost in the US or England.
Good luck.
PS- If you're considering trying a micro brewery in Buenos Aires and want a pale ale, skip Antares and hit the cerveza puerta cerrada named "Buena Birra Social Club".