I planned to take 70-284 for my MCSE elective and then someday 70-236 for MCTS, but after looking at all the other certs I want to obtain

, I don't know if I should take Exchange 2003. On the other hand, I like two things about '03 & '07 combo:
- There should be a great deal of overlap and taking '07 shortly after '03 would save me some study time.
- Seeing quite a few job postings that want Exchange experience going back as far as 2000 or even 5.5, would taking both '03 and '07 give me much better chances than '07 alone? I know that experience comes first (I have ~3 years), but how helpful is the '03 & '07 combo?
I don't want to focus entirely on Exchange, but %95 of the jobs I see (not necessarily Exchange admin/engineer) want some solid Exchange experience, among many other things. Instead of thinking what's good for my current position, I want to focus on what's better on the job market today or near future.
What do you guys think: 2003+2007 or 2007 only?