mod_rewrite Configuration Help needed?

I have the following problem, I have this standard mod_rewrite configuration for TextPattern use.

<IfModule mod_rewrite.c>
RewriteEngine On
#RewriteBase /relative/web/path/

RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^(.+) - [PT,L]

RewriteRule ^(.*) index.php
</IfModule>

This helps rewrite folders such as:
http://www.website.com/products/
into a index.php TXP compatible URL.

However, I have one real physical directory called http://www.website.com/choristes/ that I don't want to be rewritten by the RewriteRule.

Anyone can tell me how I can configure my htaccess to achieve this specific behaviour?

Thanks a lot!

Vincent