The lunare wrasse is not reef safe. It will eat shrimp, crabs and small fish. If you are trying to decide between that and the sixline, go with the sixline.
You could get a mandarin in a few months IF it eats frozen food. It's hard to find ones that eat frozen food; most will only eat live food, which is why they're hard to keep -- they eventually starve to death. If you see one at your LFS, be sure to ask the guy to feed it in front of you. If it takes the frozen food, you can go for it. If not, pass on it.