i dont know how you got the 1000 dollar figure, but it shouldnt be that much unless you are looking at replacing the entire suspension.
read this
http://www.automotiveforums.com/vbul...d.php?t=698472
i would recommend getting oem replacement springs for the 9c1 caprice
they will fit your car, but be stiffer and handle better.
get 9c1 shocks as well
i have KYB gas-a-just shocks and the difference is amazing
if you want to lower the car, get front lowering spindles
you can lower the rear, but i think it would look fine with a 2" front drop and the rear at stock height
if you install the parts, which you should because its easy, i cant see it going over 500 dollars or 700 max