WoWInterface - View Single Post - Balkenansicht gescannter Gegner ?

This Magic Target's gets as close as possible to what you want.

Besides of that, simply use nameplates.

__________________
Rock: "We're sub-standard DPS. Nerf Paper, Scissors are fine."
Paper: "OMG, WTF, Scissors!"
Scissors: "Rock is OP and Paper are QQers. We need PvP buffs."

"neeh the game wont be remembered as the game who made blizz the most money, it will be remembered as the game who had the most QQ'ers that just couldnt quit the game for some reason..."