I believe this is what I will do regarding upgrading the suspension of my car. (This is as far as I got with my research):

Sway Bars
28.5mm Front Bar OEM# 124-323-77-65
18.0mm Rear Bar OEM# 124-326-25-65
or
Eibach if I can come across a set

Struts/Shocks

Bilstein Heavy Duty Front Part # V36-0361 - Already have these
Bilstein Heavy Duty Rear Part# B36-1385 - Already have these

Springs

Eibach Pro Kit Part# 2517.140
or
H&R Part# 29569-2


Strut Brace

Weichers Sport Bar


Wheels and Tires

Probably 17 inch

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1989 300CE Astralsilber/Schwarz
1992 300CE Schwarz/Schwarz