The best way and most flexible way to handle this to be have some data entered into the Custom Header Options area as shown below –
https://docs.google.com/file/d/0B9j6FQo4cSQFRkFJcjhwbzhaWTQ/edit?usp=drivesdk
This way you won’t need any CSS to replace the default title area.
For custom CSS to replace default header in any page with no custom header specified, you can use the following in Custom CSS tab in options panel (with the page id changed) –
.page-id-472 #before-content-area-wrap {
display: none;
}