I voted other: What books get used depends on who is running the campaign. Most of the guys who have run 3Ed (that's right...not 3.5) campaigns in our group limit themselves to the WoTC core 3 + the softcover classbooks.
I, however, own and like to use several 3rd party publishers' material...but I'm not running anything right now.
I, however, own and like to use several 3rd party publishers' material...but I'm not running anything right now.