Most will eventually outgrow the 75 gallon, unfortunately. Even in a 180Gal. most Triggers will eventually not have enough space to be comfortable and will take it out on their tankmates...
There are a ton you could keep in there for a bit, with plans to upgrade or have a bigger home you can give them to down the road.
One of my favorites that does not grow too huge too quick is the African Gold Heart Trigger...one of the coolest looking Triggers there is and they have a good disposition.