Fairy/flasher wrasses will be okay stocking-wise and reefsafe, but they can jump so you might want to do something about covering the overflow if you decide on them. They are otherwise absolutely awesome, peaceful, gorgeous fish, eat anything and are out all the time. If your LFS doesn't normally stock them, they should be able to get some in (it is harder to find specific species in an LFS but they should have some type(s) of fairy wrasse).
I believe most butterfly fish aren't reef safe...
Sorry, don't know much about tang tank sizing. If you're truely lazy, you might not want two big fish (ie, two tangs) in a reef... the fewer fish in the tank, the better water quality will be.
I think you'd be fine with a tang (kole or scopas), a pygmy angel (or some kind of dwarf angel), a trio of fairy wrasses, a jawfish, and a few gobies (or a goby and a blenny). But I'm not an expert on stocking levels, let alone reef tank stocking levels.
Also look into neon gobies, they are reef safe, tank bred, get along with each other and/or larger gobies (mine didn't like clown gobies), and tiny so won't really affect your stocking level.