The drivetrain in that car is virtually identical to the 95 E320.

The pre-facelift, pre-5 speed W210s are pretty rock-solid, assuming proper maintenance. Spring perches would be the largest area for concern. The rear window regulators are pretty junky, too, but they are inexpensive and easy to replace for the DIYer.

And I'd second the PPI. Either it will find nothing significant and you can rest a bit easier, it will find deal-killers -- and you can still rest easy -- or it will find something that supports a basis to negotiate a better deal.

Good luck.