I second M.B.Doc's comments on shocks. I used the HDs and was v. happy with them.

Rick Ellinger has a set of springs available, check out:
http://www.rc-imports.com/Parts&Services/racing_parts.html

Front spring seats nub height
123 321 13 84 1 8
123 321 14 84 2 13
123 321 15 84 3 18
123 321 16 84 4 23
Each 5 mm difference changes vehicle height 8mm

Rear spring seats
115 325 22 44 1 9.5
115 325 23 44 2 14
115 325 24 44 3 19
Each 5 mm difference changes vehicle height 7mm

STD front spring 123 313 36 04
Std rear spring 280CE 123 324 06 04
123 324 29 04 lowers car 30mm
Std rear spring 300 CD 123 324 35 04 (I think)
If so 123 324 34 04 would lower car 30mm or so

Std rear sway bar 123 326 45 65 is 13mm
123 326 46 65 is 15mm, that doesn't seem like much but it"s 77% stiffer!
Bushings for 15mm bar are 124 326 21 81.

I've got 2 2 nub front spring seats and 2 1 nub rear spring seats left
over. Let me know if you're interested in them. They cost less than $10 each new.

If you're going to swap springs yourself, use the right spring compressor and be careful. Good luck.