Like I said the other night Nick, the Ventura springs from GSF I put on the wifes Polo makes the ride bloody hard, so I would presume the kit they sell would include these springs, as they are relatively cheap.
Have you cosidered standard shocks and the Eibach springs, it'll bring it down about 30-40mm and suit the OE shocks a treat. I have ridden in a few cars with standard shocks and eibachs, and the difference is negligible.