Advanced Forum and overriding node.tpl.php of a specific node

First of all thanks for your work on this very needed project.

I wanted to override node.tpl.php file for a specific non-forum node, following this tip: http://drupal.org/node/136647

This worked fine, but now I have problems with Advanced Forum: Only the comments get themed properly, while the main post (node) doesn't get themed.

This is an extract from my template.php (the theme is Aurora):

function _phptemplate_variables($hook, $vars = array()) {
  if (module_exists('advanced_forum')) {
    $vars = advanced_forum_addvars($hook, $vars);
  }
  switch ($hook) {
    // Send a new variable, $has_terms, to see wether the current node has any terms
    case 'node':
      if(count(taxonomy_node_get_terms($vars['node']->nid)))
        $vars['has_terms'] = TRUE;
      else
        $vars['has_terms'] = FALSE;
      $vars['template_files'] = array('node-'. $vars['nid']);
      break;
  }

  return $vars;
}

The problem disappears when i remove the line $vars['template_files'] = array('node-'. $vars['nid']); but then I'm unable to theme individual nodes. I hope that someone could give me a hand with this, since I'm not a coder, but I'm trying to learn.