Here's the deal. I'm installing WordPress to a new site, but I need to do maintenance and testing that only I can see and access. No visitors. No spiders. I currently have a countdown page showing, but I want it to still show even after I begin setting up the site.

I need the mod rewrite rules to show the wordpress index.PHP only to my static IP address, while showing the old, coming soon index.HTML page to everyone else. Here's the default htaccess mod rewrite rules that wordpress currently employs:
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]