I agree with the above ideas about the Hippo
You'll enjoy a Kole tang. It'll probably make friends with your planned One Spot as they are both very active and will scare the crap out of all your other fish during feedings as they like to dart around
Do you really want 2 clowns ? They are territorial enough in singles ...
I got rid of mine 'cause he/she turned into a territorial Jerk at about 16 months
Chromis tend to, from reading, kill each other off or just flat out die, so you'll end up with 1, or 2 if you're lucky - maybe 3
Bangaii Cardinals are boring as hell. Just hover. When mine hit 18 months it started bossing everyone around. Jerk
Chalk Bass I don't have experience with, but I think they tend to hover so - boring
I have a Purple Firefish and, although it's nice to look at .... boring
I have 2 Flasher Wrasses - Filamented and Yellow fin - neither one flashes ... boring. The Yellow is nice to look at though
Royal Grammas are a bit boring too as they don't move around much
I haven't had Yellow tangs, and haven't yet risked Angels although your 2 are the ones on my list if I ever feel 'risky'
I went through a whole bunch of what you are thinking about right now
I got rid of my Kole, One Spot and Ocellaris and bought a bunch of Wrasses
The available colors and dispositions covered everything I was looking for
Good luck !!