The best metal guitarist right now, in my humble opinion, is Jeff Loomis of Nevermore. He can do everything, and do it very, very well.

For a great primer, listen to these Nevermore tunes:
- Seven Tongues of God
- Inside For Walls
- Engines of Hate
- Narcosynthesis
- Fault of the Flesh

Here's a Link to his picture:
http://www.vampster.com/alive/gallery/show.php3?id=8

There we go.