I just replaced my original stock electronic shocks with adjustable Koni's from www.shox.com - their price was $504 but it just went up a bit I think. www.supercoupeperformance.com lists them at $510, and Bill is a good guy to deal with.
Shipping via UPS from California was free, but I had to pay duty and taxes when I picked them up.
Intallation of the rears is dead easy, but the fronts you will need to take the strut assembly to a shop and have them change them. The new front shocks stick in the casing of the old shock after it's top has been cut off.