But to answer specifically to your question, Damien:
I'm planning on taking the SCEA exams as well. I'm also planning on buying:
(a) Sun Certified Enterprise Architect for J2EE technology: Study Guide By Mark Cade and Simon Roberts
(b) Core J2EE Patterns: Bests Practices and Design Strategies by Deepak Alur, Dan Malks and John Crupi
This one:
(c) Sun Certified Enterprise Architect for Java EE Study Guide (Exam 310-051): Study Guide
looks to me like a different edition of (a) -- I mean, they cover the same ground and it's a matter of taste which one you choose, but I don't see the point in buying both.
With respect to:
Enterprise JavaBeans 3.0 by Bill Burke and Richard Monson-Haefel
What about
EJB 3 in action? Again, a matter of taste whether you prefer o'Reilly or the In Action series, but I like In Action.
For me, I'm going to read the books and decide, but I think this will probably be sufficient.
Cheers-
Paul