If you can narrow down to your favorite type of fishes/species such as: Tangs, Butterflies, angels (dwarf since this is a 54 gallon tank size), gobies, dottybacks, etc... and rank the orders of your favorite species, most of us can help you much better to your preferrence.
Say as an example:
Favorite:
1 - Butterflies (copperband, long nose, pyramid) (favorite first, then next to favorite)
2 - Tangs (yellow, blue hippo)
3 - Gobies (orange red spotted, orange/purple firefish, high fin red goby, yashia)
4 - Angels (flame, bicolor)
You can find out a lot on www.marinecenter.com . Just give us a rough list of what you like in first impression. And we'll chime in whether those would work for your tank and the order they should be going in. Don't worry so much about making mistake. The best thing is you had posted here for everyone to help you.
Cheers,
KLee