This week's book giveaway is in the OCMJEA forum. We're giving away four copies of OCM Java EE 6 Enterprise Architect Exam Guide and have Paul Allen & Joseph Bambara on-line! See this thread for details.
Sounds like you already have the right foundation to start preparing for the exam. Apart from the things you mentioned, you will also need some knowledge on Security (firewalls, applets), UML, Design Patterns (GoF), etc.
But it might be worth waiting till SCEA 5 Final is out.
Wherein you will also be tested in EJB 3, JPA, JSF, Core J2EE Patterns, etc.