Do you have to choose between those three? IF not, how about the Head Youtek Prestige Pro? Or the Babolat Pure Storm Tour (or the Babolat Pure Storm with some lead)?
Personally I think the racquets I mention above are going to be better suited to a top level junior. The Rebel is so demanding, a lot of D1 players want something a bit more forgiving than the Rebel. The Speed Pro has such a high swingweight, it is too demanding for many. The Dunlop is a good racquet, and would be worth a demo.