I'm looking for a foundation tree that can help shade my house. The tree will be planted about 5 feet from the house. My first thought was an upright form of a crape myrtle variety that grows to 15-20 feet. I already have crape myrtles at both corners though, so I'm not sure that will provide enough variety in the view. Any other suggestions for a tree that's not going to cover up windows, be big enough to provide some shade, but not be so big that it looks out of place?