4.2k is pretty damn generous for an e30. However, the 4.1k quote they came up with is extremely low, do you know who valued it at that to fix it? I'd say the real cost to fix it is much higher so you should be able to get them to go up.
Meet with them and nickel and dime it and they should go up a bit. Explain to them how clean your car is and yada yada.