Well if your goal requires you to get some certification-based-qualifications,
you should go for SCWCD. But taking SCWCD is not really needed to work on web development. There are lot of
Java programmers working successfully without getting those Sun certifications. IMO you should target on what you need to approach your goal (and it should be more specific). But remember that a programmer who is owning SCJP certificate is 'typically' treated as 'professional' than a programmer who doesn't have it. This is same as to the SCWCD certification for the web development. But this evaluation may be overridden by your experiences and practical knowledge.
Devaka.