I used to subscribe to World Soccer. As a monthly, you're always behind the times. But what's good about it is its world league coverage. Yet the articles are always short and relatively fluffy -- leaving you wanting a little more detail and depth.
Calcio Italia is a good mag. They sell it on newsstands in a couple places in downtown SF. Much more in depth. Some silly reporting here and there to fill up the pages. Weaker on the stats and tables, but strong on depth of Serie A coverage.
Also, this is far better than the offshoot Soccer Italia magazine that comes out of Canada. It pretty much is little more than every other issue of Calcio Italia.
The only one I subscribe to these days is Calcio 2000. Which is all in Italian, which might kill it for you right there. But they have good depth of monthy coverage, good stats and statistics from around the world leagues and particularly in the major European leagues. Where they are weakest is in CL coverage, IMO. Still, it's the best of many worlds for me and my running favorite.
Also in Italian, as Kaiser mentioned, is the classic weekly Guerin Sportivo. It's excellent for game reviews and very timely if you can get the publish->delivery times down. As a weekly, it's also quite expensive. Great focus on the Italian leagues and would be my top choice if I wanted to spend that much and could get issues much sooner. Of course, coverage outside of Italy is lacking at best.