Which one? 4.2 40v. or 4.2 FSI
 

I am looking at acquiring an Audi, which motor to get. Looking at a 2006 A6 with the 4.2 40valve. I know the newer ones have the FSI.

Is simpler better, with standard injection or ? I hope to purchase a car with under 80K miles, what are differences in service needs, timing belt
or chain, etc.