If you want a great 124 chassis car in the price range you mentioned, find a well maintained 400e and you will be very happy.
The 400e/e420 is a great car,for a little more money (initially) than the 6-cyl.
I have a few 400's that I service with over 150k on them, and the most common problem they have had is the little hose between the steering resevoir and the pump leaked. Actually it wasn't even the hose, it was the clamps. Talk about a cheap and easy fix,,,two small hose clamps and that's it.