From what you say u look like u are using GDM, and a debian based distro.
If you have other DE/WM's installed they should be listed on yor Login Manager if they where correctly installed.
If you don't see them there, as root browse to:
/usr/share/xsessions/In there you will see the list of DE/WM's currently displayed on yor login manager. If u cannot find
a .desktop file for a window manager that you have installed just create a new text file with the following:
CODE
[Desktop Entry]
Encoding=UTF-8
Type=XSession
Exec=/usr/bin/startkde
TryExec=/usr/bin/startkde
Name=KDE
Comment=The K Desktop Environment. A powerful Open Source graphical desktop environment
This eg. is for KDE, and you can use it as a template for other DE/WM you may want to add. Don't forget
to change the exec path and rename the file to YorWindowManager.desktop
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