My estimate is around $10-15k, depending on condition. These 450s hold their value well and are near their low point. Prices should climb from here, if all goes well in the used Mercedes arena. Reason I say this, is they are near 30 years old, and have kept their value fairly well. These cars also sell better in the nicer climes like your area. Be wary of shotty rust repair, espcially with the mid 70's SLs. Also be careful of early emissions equiment and the like. The owner of such a car would want to get their money back for the new paint, wheels, interior and relatively low milage motor.