Alright! If you spend a little $ on suspension you're going to have a car that you never want to stop driving. You obviously know how to build a proper car, but this list contains (IMHO) the best products for your $$ that work very well together that don't break the bank.
Front suspension:
Suspension refresh/reinforcement:
Garagistic Subframe Reinforcement:
https://store.garagistic.com/BMW-E30...nforcement-Kit
Lemforder Front Control Arms:
https://www.fcpeuro.com/products/bmw...30-e302piece-l
M3 Solid Rubber offset CABs:
https://www.fcpeuro.com/products/bmw...r-31129061222l
Lemforder tie rod assys:
https://www.fcpeuro.com/products/bmw...-32111125186-1
E36 Steering Rack (way faster lock 2 lock ratio, e30 rack is embarrassingly slow. You still use your factory lines/resevoir):
http://shop.rackdoctor.net/1995-BMW-...995-533-M3.htm
Steering rack swap kit:
https://store.garagistic.com/e30-ste...ion-z3-e36-e46
Stainless lines:
https://store.garagistic.com/e30-sta...el-brake-lines
Swaybar kit:
https://store.garagistic.com/E30-Adj...SABEgK8ofD_BwE
Best simple combo for lowering:
IE3 Springs:
http://www.iemotorsport.com/bmw/item/e30rspring.html
Konis (koni valving is HIGHLY preferred to bilstein on these cars):
https://www.ecstuning.com/b-koni-par...it/86411021kt/
E90 drop hats:
https://store.garagistic.com/BMW-E30...der=ASC&page=2
A million times better but a little more work:
https://groundcontrolstore.com/colle...-length-struts
https://groundcontrolstore.com/colle...prepared-class
Rear Suspension: Poly bushings in the back of an E30 are noisy and annoying. Febi/Corteco are the way to go.
TA Bushings (x2):
https://www.fcpeuro.com/products/bmw...nt-33329061945
Subframe Bushings (x2):
https://www.fcpeuro.com/products/bmw...r-33311129144l
Diff bushing:
https://www.fcpeuro.com/products/bmw...es-33171135242
Adjustable rear suspension camber/toe (e30s don't have rear adj and toe-in a ton aka crazy tire wear and lack of contact patch):
http://www.iemotorsport.com/bmw/item...bkit-lock.html
http://www.iemotorsport.com/bmw/item...ekit-lock.html
Hope that helps narrow down the giant lists of which e30 suspension parts are good/bad.