Newbie- Please advise with concerns

Greetings to all M5 enthusiast!!

I am (like all of you) a HUGE M fan. I have an opportunity to pick up a '02 M5 that is in exceptional condition (so I'm told). The car has 98,000 on the clock and dealer states it has a new clutch & "DINAN Software". The asking price is $15,900 and it is not from a BMW dealership. Coming from a Honda/Acura background I have always treasured the "reliability" of the VTEC engine, and will be the first to say that the M5 has always been a dream and is simply in a class all by itself- HANDS DOWN.

My concerns are of course the dreaded stories of the "problems" that arise after 100k, and the amount of money I am expecting to spend maintaining the monster (from scheduled maintenance to unexpected and "issues" the car is known to have. Any thoughts, advice that you all can give will be greatly appreciated. I have included the link that shows the car- thanks again for sharing your knowledge

http://www.autotrader.com/fyc/vdp.js...standard=false