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How to disable X at boot time?

How do I boot Ubuntu by default into the CLI using a multiuser runlevel? I wish to still maintain my graphical desktop manager (GDM or whatever replaced it) since I do use that to switch between Unity and Awesome WM. I do however wish to boot by default into a CLI login shell. I could then startx to start my GUI if I need it. I am aware that Ctrl-Alt-(F1-6) will open a separate tty instance with a login shell but it seems wasteful to have a GUI running even if asleep if I am working purely from the command line.