im using all of troy stetinas books at the moment my friend by recommendation of my guitar tutor.theres metal lead guitar primer and then lead guitar vol 1.also use metal rhythm guitar with these ones also.there agreat starting point and are good fun and great for technique.i also use all JP,s stuff and have wild stringdom&rock dicipline which are great for your hands to build good technique and stretching.check em out!
another good tuition site i heard about recently from these guys on the forum is Shred Academy - Exclusive Lessons for Lead Guitarists .there are good lessons on this site too and its free to use.