yeah the Eibli is the hardest of the bunch, but i have had a flame and it was not sensetive to me it was quite easy to care for plus i had him for awhile until i traded him
i like my lemonpeel personally. he was very shy at first, but now he always comes to the front of the tank to greet me. plus he beats the hell out of the domino damsel that i cant get out of my tank but want out.
I would vote for the Coral Beauty. I had mine for over a year before a rock slide killed him. Now I have a Rusty and he is doing great. I would stay away from the bicolor, they don't seem to live too long.
the most peaceful and the hardiest is definitly the Knox or Midnight Angel.....great fish specially if it is for a reef
but if its not a reef and is agressive a flame angel has a little better chance do to agression
Brad