Growing hydro is a bit tricky for the uninitiated and generally not recommended for first time growers. Hydro is not as forgiving as soil and if something goes wrong, there is less time to correct it. I would strongly suggest you do a couple soil grows first, learn the plants, then make the move to hydro.
Regarding that box, I think it's a bit expensive. You could build a box and outfit it yourself for less money than they want for that turnkey setup.