Thanks Neal. I am going to look into those Exbury Azaleas for another spot.
I think I will try a Kalmia in this spot. They are so beautiful when in bloom and look great the rest of the year. The one that I really love has "Fire" in it's name and has a dark dark pink bloom with a red coloring on the underside of the petals. Very striking.
I find that the Viburnums do very well under the Maples as well as several of the Philadelphus. Buddleia White Profusion, Beautyberry & also Roses don't seem to mind the competition either, especially the Rugosas. I also have some varigated Eumonymous thriving under some Maples.