I've used this script, which is a modified version of sp_help_revlogin, to script out logins, server roles, database users, database roles, and object permissions. Remember that the databases need to exist in the destination server before you can create users. Considering that, you might as well backup and restore the databases, which would also move the database users and their permissions.

http://www.sqlservercentral.com/scripts/31776/