I love thrash. My favorite thrash band as of now is Exodus, specifically their current lineup. The last several releases have all been amazing. Seeing'em live again in a few weeks, after a 2 and 1/2 year lull of support slots of theirs that I regrettably passed up or had to miss.
I of course am a fan of all the obvious band (Metallica and Megadeth actually being lesser favorites).
Anthrax was a favorite of mine in high school. Also enjoy Slayer, Testament, Over Kill, Forbidden, Sepultura, Kreator etc. And I also enjoy a lot of the modern thrash revival bands like Warbringer, Havok, Evile, Toxic Holocaust, Municipal Waste etc.