Small problem with display list of custom fields with links back to each Post

I have 2 custom fields in each Post in category 1 named “Guest Name” and “Guest Description”. I want to output a list of the custom fields with a link back to each of their respective Posts.

My code below works 90% but still has some errors. The code accurately shows the list of Guest Name and Guest Descriptions, but I need to fix 2 problems:

1) The links to their posts are not displaying. I tried get_the_permalink and the_permalink but neither seems to work. Any ideas what I should do?

2) I want to sort the list ASC by the “Guest Name” field. I can’t figure out how to do that code correctly. Any ideas?

<?php
//get all posts in category 1, then for each post, get custom fields,
//and display that info as a link
$args=array(
'showposts' => 500,
'category__in' => array(1),
'caller_get_posts'=>1
);
$posts=get_posts($args);
if ($posts) {
foreach($posts as $post) {
setup_postdata($post);
$guestdescription = get_post_meta($post->ID, 'Guest Description', true);
$guestname = get_post_meta($post->ID, 'Guest Name', true);
if ($guestname){
echo  '<a href='<?php the_permalink() ?>'>'.$guestname.'</a>: '.$guestdescription.'<br /><br />';
}
}
}
?>

Thank you~