If I had the right tank, the right mind, and lots of free cash... I would have a goldflake angel (Apolemichthys xanthopunctatus) as my "centerpiece" or showfish. They are amazing!! They are sort of kind of rare in the hobby.
They grow to 8-9 Inches long and do best in a tank over 100 US Gallons. They need lots of places to hide or they will keep out of sight. The more "comfy" they feel, the more they stay out, in the viewing area of your display.
They are omnivores, eating marine algaes, prepared alga foods, (spirulina flake, nori sheets etc.) ,micro crustaceans (mysid, pods), and, since they are true angels, marine sponge. If you want to keep sponge, this is not the fish for you. If you want to keep the fish, you need to get a marine food with sponge in it, such as Ocean Nutrition's Angel Foods.
Just as with any "angel", short of the dwarves like flames, they can be agressive. Best to add this fish last to your system.
Dave
