I would add more wrasse in the list
Here is my list
Cheap and colorful
Clown fairy wrasse
Tri color fairy wrasse
Melanurus ( eats flatworms)
Red margin
Tamarin wrasse
Leopard wrasse
Red fin fairy
Mystery wrasse
Moderately price
Labouti fairy
Scott's fairy
Lineatus fairy trio
More female flame
If you want powder blue and Achilles
One have to be much bigger to prevent fighting
Moorish idol is very nice but it stress out too easily specially with your minimal aquascape with Achilles and powder blue ick will most likely spread quick and deadly even with 2 months of QT.
I suggest to add the regal first along with the naso
Add the sohal, Achilles and powder blue together.
Multiple Anthias are very colorful but requires a lot of feeding and its too difficult to satisfy the high metabolic requirement long time in a large group.
This is only my personal experience
I might be wrong!