I am from Argentina, and I wouldnt bet on them. Have you seen them play in the last 5 or so games. You can´t seriously considering them. Messi cant win it by himself. Plus, Maradona asks him to play in a total different way than he plays in Barcelona. Did you know that Maradona plans to play only with centrebacks. I mean, with players that usually play in centreback position. He put like 2 fullbacks on the list, which will be on the bench. It would not surprise anyone in Argentina if we dont make it through the group stage.
Anyway, my favourites are Spain, but like in any WC, favourites hardly win. Even though its hard for me to say it, jejeje, I strongly believe that England has a very good shot at the title this year. The team is good, well balanced except GK position, and the Coach, is a specialist in winning things.