Metallica all the way....(except reload, reloaded and st. anger, because they all suck and its during the time Metallica totally sold out and become some trashy commercial representation of themselves)
Master of Puppets.
And Justice for All....
Ride the Lightning...
Black Album
If you want to go early raw Metallica, Kill Em All.
Megadeth, So Far So Good So What (502 and Mary Jane)
Helloween where also OK, before they totally lost the plot with Dr. Stein, so early stuff like Keeper of the Seven Keys.