Alright, I don't know if anyone's caught onto this, but I just wanna let you know that there are very few triggers that will be compatible with lionfish. Nigers and blue throats are about the only two. Most others usually rip lions apart. So either pick lions or triggers, unless you like nigers and blue throats. I personally think blue throats are really cool looking. The variation of puffers, lions, and eels is fine though. In a large enough tank, a nice wrasse will look great in there too (lunare or dragon?)
Next, in no way am I saying that anyone's tanks or ideas are wrong, but I just wanna offer how I have my 75 gallon aggressive tank set-up. It's been up and running successfully for a year and almost a half now, and I have close to 90 lbs. of live rock in the tank (no base rock). I purchased the rock very brown and ugly, however, now, my rock is almost all covered in coralline (I did not upgrade my lighting). To get the coralline to start growing, I used Marc Weiss' Coral Vital, and it really took off. Plus, I use Oceanic salt, which has a very good calcium level. I also have three pieces of 'fake coral'. I probably would have taken it out long ago, but my fish love using them for shelter and hang-out. They are the favorite hang-outs of my lawn mower and hawk, so I just left them in there. They do add a nice bit of color to the tank, though, and they do not look like they don't belong. As for a filter, I use a wet/dry that I turned into a fuge. I took the bio balls out because I have so much live rock, and I put a clump of chaetomorpha into the wet/dry, with a 60watt power compact light on the wet/dry (the light cost me $15 at Home Depot). I run a Mag pump in the wet/dry, with two AquaClear powerheads in the tank for extra circulation. And as for a substrate, I have a 1/2 inch of aragonite in the tank (just enough to cover the glass).
In the tank, I have a volitan lion, striped puffer (who is the pig of the tank), arc eye hawk, engineer goby (excellent cleaner of my aragonite), gudgeon goby, lawn mower blenny (excellent live rock cleaner), 11 mexican turbo snails and blue leg hermit crabs, one chocolate chip star, and two serpent stars. I am in the planning process of setting up a 210 gallon fish tank, hopefully to have done between September-December of this year.
Hope this helped a little bit. To answer your last question, I would not go with any angels, but there are definitely a few tangs that could go in a large aggressive tank.