600wBallast, What else?

Im about to order a 600w dimmable ballast. What else do i need? So i can order it all together with out doing two seperate order and twiddeling my thumbs..

Any product suggestion would be nice also. I attached tags to the two ballast im looking at. Im leaning towards the dimmable so that i may run 400w during veg and 600w for flowering..
http://www.amazon.com/gp/offer-list...w?ie=UTF8&qid=1290491171&sr=1-9&condition=new
http://www.amazon.com/Lumatek-600W-120-240v-Ballast/dp/B00286N7NQ

once you decide on a ballast that makes you happy , you are going to need a light hood . I would recommend one that is air cooled . The insulated glass will make a hugh difference .