Kyb Agx?

I'm looking into purchasing set of four KYB AGX Gas Shox off of group buy for $335. These have the 8 position adjusting with the screwdrive on'em. Any information on these. Also are these just fine for my suspension or should I also be purchasing a set of springs (Eibach Pro Kit) to put over them? What will the advantage be with adding the spring set to'em? Can you adjust or lower the car w/ just the shocks or do you have to have the springs also? Any comments or suggestions are appreciated first big buy for my car. Lookin for a good price think it's well worth it...prolly would wait till after winter to put'em on. Ideas?