Metallica - And Justice for All - greatest Metal album ever, Master of Puppets, a close second.
Yngwie Malmsteen (with or without Rising Force, with either Jeff Scott Soto or Mark Boals and lead singer, and NOT with Joe Lynn Turner as lead singer)
Dio - either with or withot Sabbath. He was great with them, and great without them.
Pantera
Disturbed - Didn't see these guys mentioned anywhere. IMO, a cut above the rest of today's screamers.