I'm a coco/pureblend Pro combo user, and a HAPPY one.
IMO the hydroton is unnecessary, as is the perlite... but be sure to buy a high quality coco, such as the Botanicare stuff.

A nice thing about the pureblend packaging is that it gives instructions for different stages of the plant's life right on the bottle... all the different diluton rates you will need to know are right there.