stocking is my favorite part of setting up a tank!
here's how I see it
I'm not really familiar with wrasses. I have a little 4line in my reef but he's nothing like a lunar or banana.
The triggers will also get big and are territorial. In your list I think the niger is your best bet but still I think the tank would be too small. The clowns get HUGE and mean and I think the same for picasso
You may have to look to some other fish
However, other people might dissagree but some are good choices IMO
the coral beauty,
flame hawk and the blue dot puffer.
the blue dot puffer that I believe you are looking at is a Canthigastar. They are cool and stay small!
Although I read that cathigastars can be nippy to other fish, but the other fish should be able to handle themselves.
Anyways that's how I see it, I'd start there and then choose from there.
what's the dimensions of that tank anyways?
well HTH!