Howdy, Javier.
I think it really depends on what you want for your professional carrer. For example, if you want to work with web development,
you should go for SCWCD, then maybe SCBCD... or if you want to work with software architecture, you could read some books related to security, UML, software design,
patterns, then try
SCEA. It really depends.
I personally think SCJD is the coolest certification
Cheers, Roberto Perillo
SCJP, SCWCD, SCJD, SCBCD