I have some dinnerplate ones but they are so large and heavy they are only really good for floating arrangements. I use a lot of spider dahlias, they are really attractive and last a while and are quite sturdy in the vase.
As for zinnias I never found a bad one. I tell you they last longer in an arrangement than almost any flower I have ever worked with. I often make an arrangement and after a week or more throw out everything except the zinnias, which I use in the next one.
