I really like Trade Secret, Mary Ann. For my 'T' iris I will have to go with one that is a reliable bloomer and re-bloomer, and is also just a beautiful little iris.
MDB Trimmed Velvet
Someone handed me a little rhizome of this iris at a plant exchange in April several years ago. I planted it and it bloomed that fall and has never missed a bloom time since. The only complaint possible is that it is not a fast increaser. However, maybe that is just in my area.