I had often thought of going the power route with a Taurus moonroof, or a Contour/Mystique.....there's plenty of roof line to work with, I just haven't been able to commit the time or resources to it. My only concern is how much head room might be lost in the process. At 6' 3", I need all I can get.
If you're worried that cutting a hole in your roof hurts the resale, one could always go this route if they wanted to.
http://all-funny.info/extremely-fashion-and-fake-sunroof-from-ebay