Spend the extra $$$$ for adjustable dampening. There are many good fully adjustable coilovers out there. A few that I have exp. with H&R, Koni, Tanabe, HKS, Toda, Tein.
www.modacar.com has a good sized assortment.
To get the most out of your adjustments you WILL need camber kits. Pillow ball mounts are an option. Also don't forget to have the car aligned after every height adjustment and after first install, corner weighting is optional(i recommend it).
A few other things related to improved handling
1. Good tires
2. Rear sway bar / front
3. Upper/lower tie bars
In order of importance.