Having just completed my MCSA and now upgrading my best advise would be not to use MCDST as your elective as you are taking 2 exams instead of one and also 70-210 is a retired exam as its for Windows 2000 professional.
For MCSA you need 70-290 and 70-291 then a Client OS Elective this can be 70-270, 70-620 or 70-680 then one elective exam(Which the MCDST could be used towards but it would not be worth it unless you have already completed)
Take a look here for a list
http://www.microsoft.com/learning/en/us/certification/mcsa.aspx#tab2
It all depends on what you are already doing to which path you take I had to take MCSA as this was the only way to get a wage increase from the work the MCITP not being recognised as qualifying (strangely enough in a large IT company).
My personal track to do mine was starting of with the OS exam 70-270 then moving on to 70-290 and 70-291 before taking 70-680 as my elective. 70-680 gives me a good starting block for moving on to my MCITP.
Hope this helps
Regards
Kevin
