My CCNA(version 3) is due to be renewed by Feb 2009, looking over the new version it looks like things have totally changed.
Would this be a relatively correct assumption?
Looks like ISDN's taken a back seat :P
From what you told me your interested it, that is what I would do if I were in your shoes. If you have the BSCI and BSMSN passed by the time you get a job, it can dictate what path you should choose. If you get a job working with designing networks more, CCDP would be the path to go for. If your configuring and troubleshooting routing and switching more, then CCNP would be more beneficial.