I was in a similar boat.
I also am setting up a 75g FOWLR and couldn't figure out a fish list.
I love aggressive fish but a 75g just isn't big enough to do what you most likely want to do. Lions, triggers, and puffers don't mix very well and those are the three things I wanted most so I sort of chose peaceful by default.
I am still getting the best of both worlds though, IMO. I spoke with namxas (successful with a number of lionfish species) and he believed that two small dwarf lions (even a M-F-F trio) would be fine in the 75g with other peaceful fish as long as the size differential is in the favor of the OTHER fish.
Find small dwarf lions (not redundant! because even the dwarfs get >6") and you can get away with just about everything except little gobies.
For what it's worth here's my desired fish list currently:
Two ocellaris clowns
Two flame hawks
Two dwarf zebra lions
Kole tang
4-5 lyretail anthias
Maybe another pair of something that swims at the top of the tank like firefish...but I'd still be worried about losing them to the lions at some point.
I plan on heavy feedings multiple times per day (it's going in my office - work from home) to keep everyone happy and friendly.
There really isn't any trigger that will be happy in a tank this size.
Anyone know if a blue spotted puffer would be okay in this tank?