So what else should i get?
 

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!!!

Get some more Wrasses they come in many colours and have lots of personality.

+1, Here are some nice ones to start with:
Pseudocheilinus ocellatus (Mystery)
Paracheilinus mccoskeri (McCosters)
Cirrhilabrus jordani (Flame)

and my personal favorite Cirrhilabrus laboutei (Laboutei wrasse, of course with any wrasses a screen on the tank will prevent you from wasting your money).

any of this mentioned wrasses hide like my 6 line that never comes out?
i want them visible!

i have seen a mystery wrasse in person, holy cow he was amazing looking. Looked like a mad scientist or a meth addict.

look into a Flame/fire hawk fish, i have one and he is great to watch! Awesome personality, colorful, and sketchy as can be, i dont think he trusts anyone. lol

My Solarensis is out all the time and swims through my hand. I can literally catch it with my hand. My Melanarus wrasse is out all the time and is a good hunter . My mystery wrasse is out all the time as well. All have great personalities.

Bird wrasses look quite special imo... you can also go for a small lionfish or an eel,,, that is if you are not planning on having small fish or shrimps...
I am quite surprised about your 6line... I've had 6 of them over the years and they were never hiding.... make sure ypur tank is covered thou...they jump!

i have shirmp, i rather have them over eel/lion fish
plus i got a few small fish in the tank right now (clowns)