I would go with the Bilstein Sport shocks if you want slightly stiffer than stock for a performance improvement, they are not harsh at all only slightly stiffer than OEM. These are designed for lowered cars.
The Bilstein HD are pretty much identical to OEM (20% stiffer but you will not notice) and are a good choice if comfort is more important to you.
Both go for about $700 for all 4 at Turner Motorsport
in the US. Locally I know that RMP Motors
carries these and will install them.