Only from memory, I believe the most commonly ordered on, on my part, is 'Valerie Finnis'. Almost turquoise. Google it. Beautiful. They may have already put out foliage in my garden, which will be green all Winter.
There are several selections of dark blue-violet, that are fine.
Still waiting for a white sort with decent sized flowers at a decent price. The commonest white has smaller than typical flower spikes.

Thank you for the recommendation. I looked them up and they are gorgeous. Added them to my order.

I see, John Scheepers does say their White Magic is diminutive.