I don't have much money to burn so I mostly borrow or get free mags. You'll notice I'm a total nerd.
Paid subscription to:
Mix Magazine
Free subscription to:
Post Magazine
Millimeter
UR
Film and Video
I borrow from friends/occasionally purchase:
American Cinematographer
Maxim
FHM
I'd like to get more because to keep up to date on more subjects, someday money will permit that.