I wrote about my favorite music magazine, Paste Magazine in
this thread.
I subscribe to Rolling Stone. I've subscribed since 1989 and I'm now a lifetime subscriber. It's not the revolutionary, innovative magazine that it once was, and it now focuses more on the flavors-of-the-month than it does on new, up-and-coming artists. But I'm big into pop culture, and therefore I really don't mind their slant. They are definitely very much anti-Republican, but they do some excellent, EXCELLENT investigative reporting outside of music - such as Bush's failures in environmental and logging reform, the plight of the Mexican immigrants who enter America illegally, and the pot scene at the "most stoned campus in the country." They also have three excellent editors: David Fricke in music, Peter Travers in movies, and Rob Sheffield, who has a very pop-culture, snarky slant on things (which is only funny if you like that sort of thing - and for the most part, I do).
Buy one or two issues of RS and see if you like it - most issues are very similar in terms of overall content, so if you don't like it, you'll know. But read my other thread for more info on Paste, which I think is a damn fine magazine - and you get a CD and DVD to boot with the music they talk about in the mag.
I haven't read any of these but they certainly look interesting:
Blender - seems more like a music mag for Maxim readers
Under The Radar
Tracks - Seems similar to Paste, but perhaps a touch more mainstream?
Good luck and let us know what you pick up so we can pick it up ourselves!