SCP is a great extension for Magento that makes it easy to provide different prices and content for each simple product in a configurable product:
This extension changes the way that the pricing of configurable products works in Magento. With this extension enabled, a configurable product’s own price is never used. Instead, the price used is that of the matching associated product.
Best of all Simple Configurable Products is a free extension. To get started you’ll need to install SCP via Magento Connect.