Good for you!
Update:
so far we have a very clean 1997 S320 that looks like it may be a winner. We are also going to check out another nice S420 that I know about that could be a winner.
Finding one of these things is like trying to find a needle in a stack of needles!
Paul you will love the S600, nothing like hearing that 6L V12 scream. Just buy a very nice full maintaince records example and you shouldn't have to many problems.