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If you are in the US, I'd say that's one of the best bets. Although it's a little expensive I think it's one of the best supported platforms.

The Econotag II is $65 - http://www.redwirellc.com/collections/frontpage/products/eco... - do you need their router to do anything useful with this?

if you want to be able to get your data out into the web then the answer is: yes