On the positive side (and I say this in all seriousness), you can get away with alot of stuff in BA that would be a deathknell for any restaurant in the States. For example, you needn't worry about little details like havingcourteous service or edible dishes; customers are used to waiting hours for their overcooked, unseasoned food; steps of service mean nothing; and you can write the wine list in your sleep.
If you have any doubts about this, just take a stroll through Recoleta any Friday night and see which restaurants are packed. In short, I agree with Nap, think of your clientèle and your competition, and plan accordingly.