If you liked Touch of Evil, try:

Cain, James M.
    -Double Indemnity
    -The Postman Always Rings Twice

Chandler, Raymond
    -Trouble Is My Business
    -The Big Sleep
    -Farewell My Lovely
    -The Lady in the Lake
    -The High Window
    -The Little Sister
    -Playback

Fearing, Kenneth
    -The Big Clock

Hammett, Dashiell
    -The Continental Op
    -The Maltese Falcon     (one of Orrin's Top Ten Novels)
    -The Thin Man
    -The Glass Key

Homes, Geoffrey
    -Build My Gallows High

MacDonald, Ross
(Lew Archer Mysteries)
    -Black Money
    -The Chill
    -The Drowning Pool
    -The Far Side of the Dollar
    -The Galton Case     (Read Orrin's review)
    -The Moving Target
    -The Underground Man
    -The Wycherly Woman
    -The Zebra-Striped Hearse
    -Sleeping Beauty

McGivern, William
    -The Big Heat

Thompson, Jim
    -The Grifters
    -The Getaway
    -After Dark, My Sweet

Williams, Charles
    -The Hot Spot