El Yugo was closed down a few months back. It had been on the death spiral for a while. They had a nice cold salad bar.
La Chacra is a tourist trap. I would avoid this one. Check out the place next door though. I think its La'liance or something similar.
I like El Establo.
You should have a lunch and check out El Cuartito for pizza. Its near Talchuano and Paraguay. Its my favorite pizza in BA.