Adding a featured post

I have the following code inside my header tempate

<div id="board_post">
		<h3>Featured Post</h3>
<?php $recent = new WP_Query("showposts=1&orderby=rand"); while($recent->have_posts()) : $recent->the_post();?>
		<h2><?php the_title_limited(70); ?></h2>
		<p><?php the_content_limit(300); ?></p>
		<p><a href="<?php the_permalink() ?>">Read More</a></p>
<?php endwhile;?>
	</div>

Instead of having it display a random featured post I would like it to display a specific post ID, can you help me do this?