Which nation Should host the 2016 Olympics?

Arranging Olympic games is a huge job so the hosts for the games are decided 7 years before the begining. This means that 2. October 2009 will be the date when the host for the 2016 summer games will be elected at the IOC (International Olympic Committee) session.

The four canditates left are (also some Pro's and Con's):

Tokyo, Japan:
+Safe and ready Infrastructure
+Probably has the most money to be spend
+It's Japan
+The favorite of the validation committee
-There just were Olympic games in East Asia.
-Has been hit hard by the recession

Chigago, USA:
+Safe and ready Infrastructure
+More money than the rest two
-USA has hosted 4 games (summer and winter) in the last 30 years
-Some countries could boycott games held in US soil

Matrid, Spain:
+Accessible location for many countries
+Also high on the validation Committee's evaluation
-Has some work to do with the infrasture and safety

Rio De Janeiro, Brazil:
+Great location
+No games held in South America before
+Rapidly growing economy
-Must work hard on the Infrastucture and safety
-Probably still has less money than other canditates

I haven't choosen any of them as my favorite because my opinion changes between Rio and Tokio. Of cource if the games where held in Matrid I would be able to get there the easiest.