The 524td is a good car but this is way too much regardless of how well kept it is, I mean an e28 M5 costs the same and will be far more collectable as well as fun to drive. The choice is yours but I paid for $5k for a 1986 535i with less miles, lots more performance goodies and in better shape 10 years ago. This car may be worth $2-3k.

hope that helps

EDIT:e28 5 series cars are excellent, straight forward and far easier to work on than most MB, parts costs are generally less and aftermarket support on all levels is better for the bimmer. By the way, the BMW staight six, or big six is indestructable, gassers typically take upwards of 300K abusive miles. The cars really love to be driven. For me the e28 and later e34 5 series are the best Bimmers ever built, consequently they have the strongest loyalty of all BMW models. Look for a 535 or M5 instead

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Stable Mates:
1987 300TD 310K mi (Hans)
2008 Jeep Grand Cherokee OM642 165k mi (Benzrokee)