A couple of guys you should really check out are Mattias Eklundh and Guthrie Govan.
Mattias has an interesting style of playing and Guthrie does as well but isn't mainly metal.
Check these vids out:
http://www.youtube.com/watch?v=xXC6y...eature=related
http://www.youtube.com/watch?v=0Ly93ppdDB0