Upfront Magazine has proven to be a wonderful few bucks spent for my AP/CP economics classes, as well as my AP US government classes. The articles are short, well written and mostly unbiased. At the end of each edition, there is a controversial issue, in which, both sides are presented and written by experts in the field. The stories are current and short. I normally use them as bellringers to open up a topic. The students enjoy the articles and the discussions we have are fruitful.
You can preview a previous issue at their website. I have been very impressed with everything Upfront has put out. http://upfront.scholastic.com/home/