Rhinelander is one of my favorite lavender irises. It's a good grower and holds up to weather. My picture makes it look a bit more rosy then in real life I think.
Soul Mate is among the top ones in the Lavender spectrum with lots of ruffles.
Soul Mate's "Child", Got The Picture, is very nice too, a bit darker then it's "daddy"
Poet's Rhyme is an very nice Lavender bi tone
Perpetual Joy is a good grower older style bloom.
Gentle Dawn is a nice smaller bloom, but good grower.
I'm sure there are a lot more, but these come to mind, as they are all good growers here.