For straight thrash, here are some obvious ones .... early Megadeth, Slayer, Metallica. First two Testament albums are thrash gold. Tankard have some great stuff, especially their first two. Also check out the first few Razor albums. Vio-Lence, if you can get past the vocals. Kreator's Terrible Certainty and Sodoms Persecution Mania are two good ones to also check out, and as straight forwards thrash as they got early on in their careers ... you might also dig a lot their more recent albums. Early Heathen and Artillery are also really good, but have some speed metal traits.
You've probably already heard most of those, I gotta get going but will post more later when I get back.