Replacement tree for dying Cercis canadensis 'Forest Pansy'?
I put a 'forest pansy' redbud tree in my small front yard, but (long story) it got a little bit buried and is now dying from crown rot. Seeing as I'm going to have to replace it, I'm now wondering if I should go with a different tree. I've been seeing a lot of comments about how redbud reseeds prolifically, which sounds like a pain.
The tree needs to stay under 25 feet; grow reasonably fast (japanese maples, sadly, are out); have a spreading form; create dappled (rather than total) shade; and be comfortable with cool summer coastal weather. Obviously the forest pansy has burgundy leaves, but that's not a requirement. I've got a lot of ants, so trees that are popular with ants and aphids are probably not my best choice.
Any good choices come to mind?