Sanchez-casal in europe.
That is a hot spot for talented juniors looking to be at their best level.
The atmosphere is so much different, the kids have so much more drive.
I've also heard that Germany has many of the top kids as of right now, and their tennis is booming in some locations.
I would also reccomend Paris.
Again these are top knotch, it doesn't get any better than this.
And once you go there you will have kids that are so good, and you know what to compare your game to, instead of getting a false idea of comparing your game to juniors who are not very good. Thus, making you feel like you are a superior player and your really not.
Just a thought.