If we're specifying staples...
I'll play, too. Some of my favorite scores to play while writing are:
Black Hawk Down - Hanz Zimmer
Crimson Tide - Hanz Zimmer
Gladiator - Hans Zimmer and Lisa Gerrard
The Incredibles - Michael Giacchino
Pirates Of The Caribbean - Klaus Badelt & Hans Zimmer
Raiders of the Lost Ark - John Williams
Rambo: First Blood Part II - Jerry Goldsmith (one of his underated gems, IMHO)
Star Trek: The Motion Picture - Jerry Goldsmith
Superman: The Movie - John Williams
Though I don't always listen to Trek music when writing Trek, with stuff like Vanguard or other TOS-related stories, I usually gravitate toward music from the series.