the 93 300e's have the 24v that is also in the 94 and 95 e320. However, they were not rebadged until 94.
If you are going to keep it for a year, I would get the earlier model 300e because it is easier to work on, as already mentioned, and it will be a lot cheaper to buy and maintain and, most likely, cheaper insurance premiums.
Two major problem areas are the a/c (evaporator) $$$ and the front upper timing chain seal cover (it leaks). Also look out for poblems such as rough idle, it could be cheap or expensive to repair and make sure all the windows and switches are working. Otherwise, they are very solid vehicles.
I would recommend a pre-purchase inspection by a mechanic familiar with MB's.