custom headers for static home page and posts page

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Instead of using include(TEMPLATEPATH use the built in WordPress API.

The WordPress API accommodates for using different headers.

<?php 
       if (is_front_page() ) {
               get_header( 'front' );

        } else {
               get_header();
       }
?>

Your custom header template should be named header-front.php and your default header should be named header.php