I also really like # 19. If the tree was more like the outline of a birch tree, I think it might look more sophisticated. I like the direction #19 is going, but lets focus on building an eye catching tree- I think a tree is a good way to go, lets play out the tree idea- maybe a clean but edgy birch tree unless that is too skinny. Also note we have to be careful it doesn't look to "teenage" like and it cannot resemble anything marijuana related. It must stay edgy but sophisticated.
I agree we should play with #17 as well, but the design here looks too "sporty" and not edgy enough. Lets play deeper with this.