The express checkout button needs to be "aligned with any other checkout buttons". Unless I have installed something wrong, my express button is on the bottom of the shopping cart page. Below the estimated shipping methods.
source PP_WebsitePaymentsPro_IntegrationGuide.pdf page 13.
PayPal recommends the following text near the logo in the regular checkout location.
"Save time. Checkout securely. Pay without sharing your financial information."