im not into aftermarket kits, only oem for e30 unless it came stock on the car like alpina, hartage etc.
if i was going to pay for any kit for e30 id get a m3 evo replica kit. costs the same as other kits but you should be paying extra and getting wide body too. sometimes i think of selling my current e30, buying a 320i and putting a m3 evo kit on and putting a M50B25 + turbo in it.