If you're planning to become a Sun Certified Enterprise Architect (
SCEA), then I'd recommend the Java EE-related certifications, such as SCWCD or SCBCD.
Note that there are no prerequisites to SCEA (you don't even have to be SCJP certified to do SCEA), but if you don't know Java EE then it's going to be very hard to do the SCEA exam.