Yes, I understand that you ask for plants from the USA and I can understand that you have been inspired by all the wonderful pictures here, but have looked at this:
http://www.cayeux-irises.com/e... (650 iris cultivars) or
http://bourdillon-iris.com/en/... (542 Irises, 957 Daylilies).
Bourdillon isn't completely translated to English which may or may not be a problem to you, but anyway worth a look, if you haven't already seen them.
Also
http://www.eurohosta.com/hemer... have some interesting varieties as well ranging from very, very cheap to more expensive (although they seem to be sold out for this year) and perhaps more in line of what you are looking for.
Personally I'm trying to narrow down my order to Cayeux
. Very, very difficult.
Also of course it is time to order some Dutch bulbs as well
