Check out this band Frontline I found a while ago, they're only in the starting stages but they're really good for a group of 16yr olds. The first new Thrash Metal band I've seen in a while that actually are "Thrash". They've also got a Pink Floyd esque song in there which is also awesome (though for some reason they think its like GN'R).
Songs to check out
Call To Arms
The Ever Swifter Hand Of Death
Without Reason
Spill The Blood
Youtube:
https://www.youtube.com/user/frontlinemetal
Myspace:
http://www.myspace.com/frontline123