I'm definately a thrash head. I prefer that straight in-your-face thrash feel like Forbidden, early Testament or The Haunted, Viking, with clean vox and fast guitar.
I'll take anything today that has the same old school structures, especially a thrash/black mix. I love the black metal feel in Dragonlord, in bands like Witchery, Dimension Zero, later Testament, (maybe the Crown, but they're pushing it).
After these, I don't really classify anything else -- Power, Progressive, Traditional etc. In Flames, Judas Priest, Helloween, Nevermore -- all this shit is great. They all go into the same pot.
Without these, then I guess I'd go doom, but this is far from my favorite style.
I will say this, I don't care for 98% of all the death metal out there. I'd listen to Ratt or Motley Crue before death.
I bet we could come up with about 200 kinds of metal genres, just make shit up like MeloDeath, IndustroDoom...
Thrasher in Sac