I have lowered springs (not King) and Bilsteins in my EB and it is great! Standard swaybars still though. I drive my car pretty sedately so I don't think the expense is justified.
Here are some prices on Bilsteins (they are a couple of years old so just use them as a guide...).
Front Shocks Price $210 each
Rear Shocks Price $170 each
Springs you should be able to get for around $120 a pair (plus fitting - rear is DIY, front you'll probably need a mechanic).