So here goes:
1.Oedipus Rex (Sophocles)
2.The Murders In the Rue Morgue (Poe)
3.The Hound of the Baskervilles (film)
4.Murder On the Orient Express (Christie)
5.Columbo (TV episode)
6.The Big Sleep (Chandler)
7.Devil In a Blue Dress (Mosley)
8.The Talented Mr. Ripley (Highsmith)
9.The Name of the Rose (Eco)
10.The Silence of the Lambs (Harris)
It works out to about 150 pages of reading a week ("Name of the Rose" is 500 pages long). We start the discussion of "Big Sleep" on Monday. It's going pretty well so far--we're also writing a mystery story as a class.
Thanks to all who made suggestions--very helpful.