Hey mate nice looking tank... Heres some suggestions on the fish you have listed:
first of all if you like the looks of sharks/ rays i would avoid puffers/triggers and even emperor angels can be an issue as they like to peck at the eyes of benthic species.
As said above if keeping pelagic sharks a larger/ circular tank is needed, however a carpet shark such as epaulette or brownbanded bamboo is fine.
Good stingray options are bluespot stingrays or mask rays, however these must go into an established tank and they do not handle nitrates well at all, so good nutrient export is essential. Getting them to feed on prepared foods can also be tricky, make sure they are feeding before purchasing them.
Tangs can be finnicky and easily stressed in a predator tank so you want to make sure you get ones that can look after themselves. Most of the ones in naso or acantharus families are fine such as: sailfin, lipstick, unicorn, dussemeri, orange shoulder etc. sohal tangs look great but can be very agressive. Even though it is a large tank in terms of water volume most tangs will outgrow it as they are a very active species and need more length than 4 feet. In my opinion fully grown large tangs need closer to 10feet of space.
If you are wanting triggers try and get the more peaceful ones such as niger, pinktail and bluejaw. Avoid clowns, picasso or queens.
Some other species to look at: threadfin snapper, clown sweetlips, red breated maori wrasse, cheeklined maori wrasse, french angel, painted lobster... Too many options to list haha.