Come to think of it, there are a couple of other ways you could finish that question...
The best looking fish:
1. Are not reef safe;
2. Will grow too big for your tank, if they live long enough;
3. Will kill or be killed by something that's already in your tank;
4. Have dietary requirements you can't possibly fulfill;
4a. No one knows exactly what they eat in the wild... in captivity they just starve.
4b. They only eat tunicates that grow at 50 degrees F.
5. Die, while the fish you hate live forever. (aquaph8)