Hi Mark,
Thanks for the advice! As I continue on my journey of dvd decision making, I will discount the idea of the overhead drop down screen console! (I was also afraid it may obscure my rear view).
The first thing I have to do now is remeasure all of my spaces! Unfortunately, it turns out that the handy-dandy measuring tape I've been carrying in my purse for the past month, was one of those 'dirty-trick' tapes! I thought those inches looked more like centimeters.....*sigh* (har har har).

I am also considering the 7" headrest screens that attach to the little metal bars of the headrest, and just attaching them from the top of the screen instead of the bottom of the screen so that they hang down over the front seatback instead of up on the back of the headrest, where the screens are actually larger than the headrests and would look, in my humble opinion, quite tacky!

Thanks again for your advice and any other advice you care to offer!
Kelly