So do you figure it'll be 10 different varieties? 24 or 25 varieties? I'm not sure how you've organized your "mix" or if there's any chance of asking to skew the colors (eg, for me I would love to be able to ask no peach, orange, orange-red, or gold).
I'm planting irises like a madwoman at the moment, but we'll see what happens by the end of the week...