To get Magento configurable product price changed when options are selected from dropdown at the frontend, you should configure superattribute prices. You can add prices to selections manually via Admin or import them with Store Manager for Magento like it is shown in this video. And do not hesitate to download free 14-days trial at: http://www.mag-manager.com/free-download/ to try Store Manager yourself. Free documentation, phone, chat and e-mail support included!