I've been to Argentina a couple of times and, quite simply, I can't bear to eat anything but steak the whole time I'm there. It would simply be a missed opportunity. I'm not normally a big steak eater, but Argentine steak is one of the world's great culinary experiences. I think the secret is that the conditions for cattle farming are pretty close to perfect and that the cooking has been refined to an art form, with all the juices sealed inside waiting for the first cut of the knife.
A lomo (fillet) or chorizo (sirloin) is going to set you back something like $4-5 even in a good parilla in Buenos Aires and a great bottle of wine can be had for c.$7.

All you can eat churrasco in Brazil is fun, but I think you inevitably sacrifice some quality for the sheer quantity of meat you are getting.

Kobe beef is very tasty, but I'd tend to go for it only in dishes such as shabu-shabu rather than taking out a mortgage to buy a whole steak...