Hi Colleen,
First, congratulations on your new home, that's very exciting. A moon garden is not just night blooming plants, it is a garden of white plants and flowers that glow in the moonlight. I think your container idea is great. It will look lovely on your new porch. As for transplanting it when you move, that's your call. It depends on what plants, etc. if they will transplant well. See how you like it in the container and then go from there. If you have perennials in it you can transplant then in the fall if you want. I would transplant early enough to give them a chance to take before the weather turns cold. Go through old post here and you will find lots of plant ideas. Also, at BHG.com there is a moon garden plan. It suggests plants and how to position them. Go to the gardening section, click on garden plans and look for "evening garden", there is also a "white garden" that will give you ideas too.
Here's a couple sites with a good list of plants: http://www.colostate.edu/Depts/CoopExt/4DMG/Flowers/night.htm http://www.emmitsburg.net/gardens/articles/adams/2003/evening_gardens.htm Good luck and have fun with it! Congrats again on the house and I wish you many years of happy porch sitting. My porch is my favorite room of my house. I added a container water garden to it this year and it is heaven. Sue | 
