You might consider a couple borbonius Anthias. I have one and plan to add another. I'm definitely an Anthias novice (this is my first one), but I absolutely love mine. It almost acts like a miniature, brightly colored Large mouth bass.
You could do the orange shoulder, tomini, and chevron without issues I believe. Same goes for the regal. I also love black tangs but 5-700$ is a lot for one fish IMO. I would love to see a multicolor or flame back pair. Jumping to that tank size I would be tempted to try another Quoyi to see if that pairing could work in a tank that size! Can't wait to see some pictures when you get some water in there

One thing I'd recommend with that rock (I have some). Every so often, before a water change, get in there with a MJ1200 and blast water into the holes and crevices. You'll be amazed at not only how much crud blows out of the rock, but from how far away from the hole your blowing into it ejects :lol: