Dark Angel (esp. Darkness Descends)
Believer (esp. Extraction From Mortality)
Sadus
Death
Vio-lence
Vengeance Rising (first two)
I have some different tastes..I'm not very much for the 'big 4' except for Megadeth, but they were very inconsistent in their style to be one specific style of metal (a bunch of power/traditional metal influences mixed in) except for like 2 albums so I can't really list them as thrash in general unless we're talking about the first album and RIP...my opinion, though..
Speed metal:
Helloween (for the EP and Walls of Jericho)
Rage (early stuff)
Agent Steel