In my 1997 Civic I recently installed an Autopage RF-420 alarm and an
Alpine CDA-9885.  For the front doors, I installed some Alpine SPS-600
two ways but I have yet to put anything in the rear deck.

The front doors suck depth wise on our particular generation of Civic.
You can replace the stockers with some shallow mounts, but the
likelihood of your screw holes lining up for the doors is nil.  Prepare
to drill additional holes to secure the speakers to the front doors.

As for the rear deck, I would do things differently mainly because I do
not like high frequencies coming from behind my head or bouncing off of
the back glass.  That is the main reason that I did not replace my rear
deck speakers in my Civic.

Regardless, I think you will be pleased with the sound you get from
replacing your stock speakers.  Just replacing my door speakers has
improved things drastically.

-Chris