I was thinking of hardy mini or small purples, realizing that the big and tall ones seem to get much more attention.
INDIAN GIVER is a semi-evergreen and embodies purple for me. Wonder how it would do...
Also a dip and SEV is the bigger, branchy PURPLE MANY FACES
And especially, PURPLE PAWPRINT, a dormant mini that I bought from the north and reblooms well here in 7a.