Ask your Ford dealer about the WOLF lowering kit. When i had my ST lowered I was offered the WOLF kit at £580 + vat (i stuck with the cheaper Eibach springs)
The kit isn't out on the market yet, but it was available through the Ford Bodyshop.
When pennies are better i'll be getting it.
On Eibach springs, the ride is most certainly firmer, but the handling of the car is increased soooo much and the lowered look, is a plus