All the Loeb/Sale books are worth reading, Batman or otherwise.

Chronology:

Challengers of the Unknown vol. 2 #1–8 (March–Oct. 1991)

Batman: Legends of the Dark Knight Halloween Special #1 (Dec. 1993)

Batman: Madness A Legends of the Dark Knight Halloween Special #1 (1994)

Batman: Ghosts Legends of the Dark Knight Halloween Special #1 (1995)

Wolverine/Gambit: Victims #1–4 (Sept.–Dec. 1995)

Batman: The Long Halloween #1–13 (Dec. 1996–Dec. 1997)

Superman For All Seasons #1–4 (Sept.–Dec. 1998)

Batman: Dark Victory #1–13 (Dec. 1999–Dec. 2000)

Daredevil: Yellow #1–6 (Aug. 2001–Jan. 2002)

Spider-Man: Blue #1–6 (July 2002 – April 2003)

Hulk: Gray #1–6 (Dec. 2003 – April 2004)

Catwoman: When in Rome #1–6 (Nov. 2004–Aug. 2005)

Solo #1 (Dec. 2004)

Captain America: White #0–5 (Sept. 2008–Dec. 2015)