I think your price is very competitive given the somewhat-low mileage and documented service history. I would hold firm unless you're absolutely need to have it sold ASAP.
Do you have the stock wheels? Maybe that would help the sale. People generally shy away from aftermarket stuff right away.
'02 ///M5 Imola Red / Imola Red '09 335i Alpine White / Coral Red
'04 E55 AMG Brilliant Silver / Anthracite
'96 318i Alpine White / Black
'01 330Ci Titanium Silver / Coral Red
'96 328i Jet Black / Black