Sweet Shadow (Acer saccharum 'Sweet Shadow')

If your garden (estate) has room for a Sugar Maple, this would be a good choice. The deeply divided lobes give the tree a graceful lacy look in summer and lovely orange color in fall. Zone 3.

Monumentale (Acer saccharum 'Monumentale')

Sugar Maples are known for their hardiness and fall color, but how about this one for a great shape, esp if you are short on horizontal space and long on vertical. zone 4