ok ... first of all. if you are so concern over the 95 97 RON, then you should stop before even thinking owning a mercedes... because the overall maintenance is going to cost you much higher (specifically speaking, exponential higher) than your average camry....

If you can afford a brand new one.. then why still consider a re-cond unit.
brand new = warranted, and you know is brand new
re-cond= you know is definitely used, so luck play big part here