Find an 87 325is, diving board bumpers bring the value down, but it still has all the same goodies that the later plastic bumper 325is has, lsd, seats, engine, obc, etc, etc.
Try and get a mint one for around 3000, then spend the rest on whatever it needs.
I know you dont do your own work, so finding one that has has all the suspension parts replaced is key, because doing a complete bushing overhall is common practice on cars this old, and im sure you do not want to pay someone upwards of 1500 bucks in labor+parts.