define ‘DB_HOST’ for Broadspire/Momentum hosting service?

I am getting the ubiquitous “Error establishing a database connection” message after running the install php.

I have spent 3 hours reading these forums and have tried all the suggestions out there but no dice resolving this issue.

I have quadruple checked my user name and password so I am pretty sure the problem is that DB_HOST is not ‘localhost’.

I have checked the list of alternatives to localhost but my hosting provider Broadspire (recently acquired by Momentum) is not on the list.

I have called and emailed tech support at Broadspire but they are not getting back to me so I thought I would ask if any of you know the DB_HOST for Broadspire/Momentum?

FYI these are my settings, in case you catch an idiotic mistake:

define('DB_NAME', 'wordpress');    // The name of the database
define('DB_USER', '[email protected]');     // Your MySQL username
define('DB_PASSWORD', 'xxxxxxx'); // ...and password
define('DB_HOST', 'localhost');    // 99% chance you won't need to change this value
define('DB_CHARSET', 'utf8');
define('DB_COLLATE', '');