Well if you want something with variety, I'd look for the Rising Metal compilation album. Good spread of '80s bands. As for what would make a good introductory playlist?
Rise up by Testament
Raze by Exodus
Ironbound by Overkill
The Moth by Death Angel
Spectral War by Cavelera
Slime and Punishment by Municipal Waste
Silhouettes by Warbringer
Arbiters of the Apocalypse by Revocation
Implode by Slayer
Isolation by Sepultura
Conquer and Destroy by Kreator
You Can't Bring Me Down by Suicidal Tendencies
Enforcer by Razor
Wake Up Dead by Megadeth
Nuclear Winter by Sodom
Brainwashed by Nuclear Assault
Heresy by Pantera