Best beer is free beer hehehehe.
Now talking seriously, for me, the best beers from this country (Chile) are this:
-Kunnstman. A brewery founded by German Immigrants in the southern part of the country, very good beer!
-Colonos del Llanquihue, another good beer from the southern Chile, this brewery was also founded by germans.
-Cerveza del Puerto, very good beer from the city/port of Valparaiso.
-Cerveza Austral: This comes from the southernmost city in the World, Punta Arenas, very good beer, too.
-In the cheap side, we have Baltica, a very cheap beer (1 lt. for just 1 euro aprox) WARNING! When you drink this shit, The hangover next day it's a fucking nightmare.
From other countries I like brands like Gulden Draak, La Trappe, La fin du monde...