| If you don't mind going abroad, I would tell you to add the London School of Economics to your list. I can't really give you my opinion on the one that you listed because I don't know too much about them.
Graduate school is important for an econ major. Most organisation (UN, WTO, IMF and so one) require that their interns or schorlaship applicants hold a Graduate degree. However I know some people who got good opportunities with a Bach....degree. Some interns at the FED said that in the undergraduate program, all you do is abstract while in graduate school you will have a chance to do some research and get involve into real economy.
If you are really into economy, there is this program that the Federal reserve bank organize every year and it is called a day at the Fed. There you can have a chance to hear "real economist " talk about economy. Their interns tell you about them and how they went to become research assistant at the FED. Some of them went to graduate school first, others did not. They got hand on experience at the FED then decide to go to graduate school. I went to one of the panel, they said that a strong background in math is good, a strong knowledge of the software and computer programs that are used in econ are a plus. One way to adjust yourself to this whole environment or to even secure a post as a research assistant at the fed is by participating in the FED challenge competition. Go on the FED web site in your area adn you will find more information about their fed challenge. are you still in HS? They also have a fed Challenge competition for HS students. | 
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