Best Practices: Home Directory on Primary Workstation?

I would like to set up an environment under Leopard in which each user's home directory is hosted on his or her primary workstation, but is also accessible as a network home from other machines via afp. What is a reasonable way to set up the directory entries so that when the user logs in on a miscellaneous machine, the home directory will auto-mount, but when he or she logs in to the primary workstation, the workstation won't go nuts trying to mount its own fileshares? Beyond "reasonable", what's a standard way of doing this?