Why don't you go Ventralis Anthias instead of the Dispar? Yep, they are expensive, but expense surely isn't an issue when you are talking about Elos setups and GemTangs :p.
Even something like Bi-Colour Anthias, they're nice and bright and easy to keep. I don't like Chromis much, but that's just me.
I really like small groups of Yellow Tangs, they look great!
I dont have too much experence with Anthias apart from the dispars I had before, which half died during transit which is meant to be normal and i remeber Az having the Ventralis and them all dying, I can certainly be convinced otherwise but im a bit nieve at the moment, I'll do some more looking into it.
I dont mind chromis, they add a bit of something different, they sure are not a feature fish but in a school meh, I know what you mean though, the idea was just as fillers.
Yeah i had the three yellow tangs before (uneven numbers) and they just swam around together all day, was my favorite thing in the tank to watch