i'm looking for an addon that puts an hp number on the nameplates
like this for example
i44.tinypic[dot]com/2jayohh[dot]jpg
without changing the blizzard normal nameplates
any addon that can do that?
Think you would be hardpressed to find an addon that does that. Blizzard doesn't maintain a lot of "essential" features; it mostly comes from authors on curse. I would try out some different nameplate addons, they are highly customizable and fairly easy to set up (I use tidyplates myself)