What you need is an experienced model. Why don't you go to the agencies? There you will have hundreds to choose from!
By the way, you were saying, this is for a cover page? Where? Singapore onlhy? Region wide? What kind of mag?
You are budgeting only for 1-2 hours for a cover shot? What about make up time? Are you asking the model to comp you the time (say 2 hours) for the make up?