the i30 Eidtion has the windows blacked out look nice. ![Cry :'(](https://i30ownersclub.com/Smileys/default/cry.gif)
do you know how dark the Edition is? when you said 'Limmo black' in your first post is that the same colour?
i think if you have heart set on it then just do it, its just tint and therefore ( i do believe) not a permanent fixture to the car, so if you ever decide its too dark you can always change it. you're the one driving the car.
personally i would get the four windows done as that looks even better than just the rear windows, but here in aus its also more of a need with the heat we have.