Please, please, I beg you! Not an effing dystopia which tells kids that this is the best of all possible worlds. Westerfield is probably the best of the type, but why the hell are we telling kids a) to be grateful to be in this world, and b) that sf is all dismal?

If you want sf, try Conor Kostick's Epic. World uses virtual reality to control it's economy, kids come along and use virtual reality to change the paradigm of the world.