I agree with Timebird.
Sin After Sin is my favorite Priest record. It's SO varied and dynamic, from all out ferocity ("Dissident Aggressor", "Sinner") to morose doom ("Here Come the Tears") to snarling sleaze ("Raw Deal") to triumphant as fuck ("Let us Prey", "Call for the Priest", "Starbreaker") to well done ballad ("Last Rose of Summer"). I can think of no Judas Priest album as complete. But for the purpose of this thread, I'd say Painkiller is second if I was in the desert island situation or what have you.
SIN AFTER SIN ÜBER ALLES!