you can buy projectors from Audi or BMW lights (maybe even s2000 lights) on ebay... usually go for about $200. Its just a matter of mounting them in the headlights and adding a little fiberglass work to finish them off... make them look like they are suposed to be there.

You're light will be brighter, the beam will be more focused on the road, instead of up in the trees and in other drivers eyes. Next time you pass a BMW or some other car with factory HID's, notice how bright the light on the road is.

The ballasts you have will work with d2s bulbs if the connectors are the "turn-lock" style... that attaches directly to the bulb.