Mainly, The Fragile by Nine Inch Nails. Because I know it like the back of my hand and sonically, it's incredibly diverse. But mostly because I know it so well.
Then I browse through other records, not always based on production merits, but again mostly because I know them. Those usually include any/some of the following:
Depeche Mode - Songs of Faith and Devotion
Tool - Lateralus
Star Wars III Soundtrack
Metallica - Black Album
Stone Temple Pilots - Tiny Music
Skinny Puppy - The Process
Led Zeppelin - Physical Graffiti
Marilyn Manson - Mechanical Animal
Theme song for Rocky II
Rush - Moving Pictures
Lenny Kravitz - Circus