Welcome, Scott and you sure do have some pretty Ti varieties.
It's such a common landscape plant here that I'd never thought of there being a lot of cultivars. I've seen so many of the dark red, and the pretty pink/cream/green one is in my garden. Wonder if its ease of propagation makes it not such a profitable plant to cultivate for sale?
Plus if the rare cultivars turn out to be slow growing, a lot of people wouldn't want them. We're so spoiled here, when everything generally grows so very fast - throw it in the ground and jump back!