Guitar Technique - Lessons and more lessons, you can never finish all the lessons in one month. In fact I ocassionally dig out some 1999 mag to play some Vai stuff. My fav.
Guitarist - Good gear reviews, some good lessons on some genres. A well rounded mag. A lot of stuff to read. Will create a lot of GAS!
Total Guitar - News/gossip, gear review, intro lessons (IMO they are quite basic). Good for starters, I started buying them when I was a kid then I go Guitarist, then now I only read GT.
All comes with CD, all from future publishing in UK. I personally don't like mag from across the Atlantic as much.