Automatically look for different templates depending on what page template you're using

functions.php

<?php
function get_page_template_name() {
  global $wp_query;
	$template_name = get_post_meta( $wp_query->post->ID, '_wp_page_template', true );
	return str_replace('.php','',$template_name);
}

header.php

<?php get_template_part( 'nav', get_page_template_name() ); ?>

nav-template-splash.php

<header>
    <h1 id="logo"><a href="<?php bloginfo('url'); ?>"><?php sc_print_logo(); ?></a></h1>
</header>

nav.php

<header>
  <h1 id="logo"><a href="<?php bloginfo('url'); ?>"><?php sc_print_logo(); ?></a></h1>
  <?php wp_nav_menu(array('theme_location'=>'header','container'=>'nav', 'menu_class' => 'menu-container', 'menu_id' => 'nav-top', 'fallback_cb'=>false)); ?>
</header>