first of all your tank looks great! Maybe you could add some tonga branch if you can find some, or add some rock to elevate the scape a bit, but nothing wrong with it as it is.
What kind of coral are looking for? Some chalices are really bright. Acans can give you a variety of colors as well. Zoas can pop, but they have can cost very little or a lot lol. Goniopora and Caro's as well.