mcl2u,
kinda depends on what your intended use is. The 3 lights you listed are quite different in size, weight, performance, etc. Can you give us an idea of what your primary use is? Tikka is a great little task light that you'll hardly notice on your head (many mornings I've woken in bed or bag still wearing it after latenite reading session). Corona's a flood monster that's great for intensive use such as caving. I've no experience w/the Septor.