how much should I pay for a parts car?

[annemarie]

I know a guy who's selling an 83 300 SD as a whole parts car and wants me to make an offer. I have an 84 300 D, and right now I need a replacement speedometer/odometer, though if his seats are as good as he says they are, I could stand to swap mine out. The body panels are the wrong color, but I figure I can part the rest of the car out to people who need stuff. What do you think is a fair price for me to pay for a parts car? I'd also have to pay to get it towed back to my place (minimum $100), as there's no title for it. Granted, I haven't seen the thing yet, but I just wanted to get an idea of the max I should offer. I was thinking $500. Too low?