Selecting users who are not friends

Hey-
I'm trying to generate a list of users who are not friends of the
currently logged in user.
I have two tables: profiles, and users_users
profiles includes the fields: id, first_name, last_name, etc...
users_users includes: id, user_id, friend_id

I can get the list of users who ARE friends:
$friends = $this->User->findAll('User.id=' . $target);

...but can't figure out how to go the other way???

My user model includes:
class User extends AppModel
{
var $name = 'User';
var $hasAndBelongsToMany = array(
'Friends' => array(
'className' => 'Profile',
'joinTable' =>'users_users',
'foreignKey' =>'user_id',
'associationForeignKey' => 'friend_id',
'unique'=> true
),
'FriendList' => array(
'className' => 'users_users',
'joinTable' =>'users_users',
'foreignKey' =>'user_id',
'associationForeignKey' => 'friend_id',
'unique'=> true
)
);
}

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