Thanks for the replies...
At this point, I am still weighing my options. I certainly like the classic lines of the W126 and would be happy with one, but I have also driven two W140 and enjoyed the way they handled as well. That is why I posted for opinions...I knew of the timing chain issue with the W126's, but I know very little about the W140's quirks. Budgetary constrants on the purchase will probably hold me at or under $15K. I was thinking of a '91 420SEL with some cash left over to change out to Euro lights and do some preventative maintenance upfront.

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Eric
'88 300E
'00 Expedition
'86 Alfa Romeo Spider
'84 Harley Davidson FLH"X"
Special Edition
'70 FJ40 Land Cruiser (basket case)