It looks like it will be a nice space. I built a 16'x28' shop with 9'ceilings. While resale is certainly important for those of us in neighborhoods, and a lot of natural light is good, I will say that big windows take away from valuable wall space. The swing out double doors are nice to have. Just make sure the wind can't fling them open! And I do have a dartboard! :) If you rip long things on the table saw, make sure there is room on both sides. Having it closer to the doors can help.
Here is a link to my shop:
http://www.sawmillcreek.org/showthre...ing&highlight=
You see that it quickly fills up!
Good luck.