I don't currently subscribe to any magazines, but one I did for many years was New Internationalist.
Centred around the fight for Global Justice, each month's edition is themed on an important world issue. Their writing is sharp, well informed, has a long term point of view and I always felt I'd gained valuable insight from reading an issue. There are no football pages, gossip sections, or stock market summaries. In short the opposite of what passes for most modern journalism.
I could write a lot about them, but you don't need to take my word for it. You can sign up for three free issues of either their print or online version, so what have you got to lose, click on the link on the left and check it out. Subscription itself isn't expensive and the online version gives you access to their entire archive.