So what else should i get?

[Milad]

I setup my first 180g SW tank and i have nice assortment clowns/tangs/gobies/wrasses and i got a few hermits/snails and a sea urchin

but what else should i get? I want a diverse reef with all kinds different animals for people to look at when they come over. I find it cool when someone sees the fish, see bright colored tang, then starts seeing the snails and gasping how cool they are then the crabs then finally see the urchin etc. I want to get things that most people haven't seen before, so what should be next on my list?

for instance:
staghorn hermit - looks different but care is high on it
lawnmower goby - already got him, looks completely different from all other fish, hilarious to watch

thoughts!!!