Hey Rager, IMO Naish make the best adj. paddles on the market at the moment. The most popular one, for a good reason, is the Naish Carbon/Glass adjustable. It has a 70% Carbon shaft with a glass blade and carbon running down the centre of the blade for extra strength. That paddle comes in a 7, 8 and 9 inch wide blade, for the kids I'd recommend the 7 inch. These paddles are super lightweight, let almost no water in and are so easy to adjust. Also as foxsup said there is the Alana paddle, which is the exact same paddle as the 7 inch carbon/glass, only with the ladies graphics on it.
Cheers
Marcel