I have several of those trees I planted 12 years ago. I like the hawthorns, dogwoods are not Kousa's so they will eventually get their usual disease but still nice. I have trouble with redbuds, but still have one left. No raintrees. Good deal.
Here is where I like to get a lot of my special plantings. Small sizes but if you have the time you can get some really exotic stuff that no one probably has.
http://www.forestfarm.com/
Send for the catalog it is the most comprehensive one I have ever seen . If it grows they have it. No pictures though. You have to know what you want. Although the website it seems has over 5000 photos. That is news since I last ordered. I will send out my order soon, although I am running out of space for much more.