I wouldn't worry about the lifespan of the engine. The entrie car will die around it and the engine will be the last thing left ticking. You can do a search, but you will find a pretty favorable opinion of the car overall.

Possible weak spots? If the evaporator leaks, it will be a pain to replace. Make sure it is in reasonable condition, otherwise expect to spend some money on various things such as suspension work, and the usual things that may need to be replaced after 12 years.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record