I have had a few of the fish you want, I'll go through the pros and cons. Clown: fun, pretty, easy (they are part of the damsel family), but they nip at your fingers which gets Annoying. Hawkfish: interesting, bright, good eater, but you won't be able have any inverts. 6 line: sleek, fast, pretty, colorful, but you need to add him last, they can be aggressive, you'll never get him out of the tank unless you take the rock apart. A coral banded shrimp isn't a good idea, they get too big, your Hawkfish might eat it, and it might eat your hawkfish/ other fish lol.
Mandarin: I've had a scooter Blenny, which has the same eating habits, but not as pretty IMO
. I took care of it well and bought it eating frozen. I had a fuge with tons of pods
but it didn't matter. He went on hunger strike and stopped eating frozen. Not knowing he was spitting out all the mysis i gave him, I went on vacation. I came back to a dead fish with a collapsed stomach. You already know why you want this one, as we all do, but I'd advise against it due to my experience with it.
I don't want this to become one of those threads ranting about not getting a mandarin, so that's the last I'm going to say about it.