Lots of metallica, back in the early days. Still trying to shake some hammetisms.
Now, mostly some pretty obscure (by this boards standards, mostly) metal (broadly speaking) guys.
Paul ryan (Origin),
Dallas Toler Wade and Karl Sanders (Nile),
Chris Feener (threat signal),
Adam Darski (aka nergal, behemoth),
Aaron Turner (Isis),
Mike Sullivan (Russian Circles)
The list goes on, you get the idea. Not really one for soloing, though I can and do sit and shred away I dont take it seriously or derive much satisfaction from it, its just for practice and out of habit. Writing and arranging riffs is what I really enjoy.