How do I set the default sort order for catalog pages?

In the same place, app / code / core / Mage / Catalog / Block / Product / List / Toolbar.php, 
from this:

$this->_availableOrder = array('name'=>'Name', 'position'=>__('Best Value'), 'price'=>__('Price'));

I just cut out this:

'position'=>__('Best Value'),

leaving this:

$this->_availableOrder = array('name'=>'NAME', 'price'=>__('PRICE'));

It works in my front end, but I am not sure if it is a correct practice or 
if it may give trouble somewhere, sometimes, later on…