It just so happens the 600's you're looking at are the earliest and most expensive vehicles MB ever made, unfortunately. I am a DIYer, and MIGHT feel risky enough to buy one in your year rage, if it was priced right... But even then...

I am personally saving money for a V8 MB of my own. I am considering 420s, 430s, and 500s (maybe even older ones, like 420SEL and 560SELs). Something perhaps like this: http://cgi.ebay.com/ebaymotors/1999-Mercedez-Benz-S420-GOOD-CONDITION-MUST-SEE_W0QQitemZ230056090484QQihZ013QQcategoryZ6336QQrdZ1QQcmdZViewItem