#16 has many interesting aspects! the figure represents health, the crown used to divide "vita" and "king" like the domain is divided by the minus "vita-king.de". The only thing is, that the font is very light. Make a test and take a look onto your computer screen from a 3m distance and compare the readability of your logo to the logo of your competitors. See what I mean? Besides that I really like what I see.
Keep in mind that the red and orange is not mandatory. If you think other colors fit better - feel free to use them.
#17 has interesting elements as well. the crown looks very nice and the mirror-effect of the "VK" looks very sophisticated
#18 is nice in terms of symmetry, but the figure's crown looks kinda strange, more like a pineapple