I would suggest you get a ticket in the 'popular' section of the stadium. Its all standing in that area, but you will experience what it means to the fans... The last game i went to i had people jumping on me and hugging me when Boca scored a goal in the last minute to win 2-1. Something i have never experienced at any other football game ive been to in the world. [/i]
Depending on your 'experience' with visiting football matches you can choose between: Platea (all-seater section) which is safer but more expensive. Yo won't find the most passionate fans there, but you have a great view on the pitch and can film and take photographs inside the stadium without being bothered by people that want you to part with your camera.
The popular is where it's at when you REALLY want to experience what it's like to visit a football match. It's dirt cheap (27 pesos), you can stand among the most fanatic supporters. Drawbacks are that: it's less safe. Human avalanches occur almost every game, there are fights and robberies and you won't be able to watch the game as well as you could in the Platea section. Tip: Leave your camera and other valuables at home when going to the popular.
Try to buy a ticket in advance, so you don't have to buy it from the touts (at a higher price) and you don't 'sponsor' the hooligans of the club. When buying a ticket from a tout, specify VERY VERY VERY clearly if you want a Platea of a Popular.