If price wasn't an issue, candy basslets.
I would not recommend a mystery wrasse. I have had two, they are jumpers and require a cover, also require a sand bed. They are not 100% reef safe from my experience, I could not keep a shrimp. They are often timid, one of mine was not shy after a couple week, the other was always shy (in a very non aggressive tank). Also they will outgrow a 40g tank. They do look amazing though.