Its nearly worth going about this a different way I think
Why not set up a custom field that automatically (programatically) gets entered with the "title tag" you want when you post.
That way its a simple custom field wp_query and you don't need to mess around with trying to get the current title.
PHP Code:
<?php $your_custom_field = get_post_meta($post->ID, 'your_custom_field', true); if($your_custom_field): ?>
<?php echo $your_custom_field; ?>
<ul>
<?php $your_list = get_posts('numberposts=-1&meta_key=series&orderby=date&order=ASC&meta_value='.$your_custom_field); foreach($your_list as $your_list):?>
<li><?php if($your_list->ID != $post->ID): ?><a href ="<?php echo get_permalink($your_list->ID); ?>"><?php endif; echo $your_list->post_title; ?></a></li>
<?php endforeach; ?>
</ul>
<?php endif; ?>
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