Which SUN J2EE Certification?

Hi,

I am currently studying Java to get a better understanding of the underlying technology for EP 6.0.

I've just completed the Java Programmer Certification and want to move onto one of the three available J2EE certifications available.

The following are available:

- SUN Certified Web Component Developer

- SUN Certified Business Component Developer

- SUN Certified Developer for Java Web Services

I'm sure they are all relevant in some way but since there is a considerable time investment involved I'd like to start with the most relevant one. Can anyone recommend which is the most appropriate to start with?

Thanks in advance for any help.

Richard