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In my (highly unprofessional) opinion, the new engines are equally as robust as the old red block engines that are so famous for their durability.
The other way to say "turbo" is "oil change" - that sucker spins like crazy (~150k rpms) and needs a constant fresh oil supply. The best way to keep your turbo going for a long time is to keep good, clean, correct oil fed into it.
I think KlausC is right on in saying the turbos in these things are pretty robust too.
I have an early AWD and I would say the only thing I 'missed' during the initial test drives was the driveshaft 'thumping' at low speed turns when the diff/bevel gear/viscous coupler is warm. Make sure to take the car on a good long highway drive and then do some tight corners in a parking lot somewhere. If the driveshaft from front-to-back thumps in the tunnel it's likely because the viscous coupler is wearing out. Admittedly it's not the end of the world as lots of them do it, but it /could/ signal less than perfect torque transmission from front-to-back (ie: does the AWD even work?) and would be a great bargaining chip (the noise and vibration is quite prominent and it would be hard to deny that something is not right - though between you and I, it doesn't appear that anything is really going to blow apart or anything either).
There's also the '4-tires-at-once' thing with the early AWD systems - the tires all have to be exactly the same size, including tread wear - and the bevel gear maintenance.
Also check for all the usual bargaining chips - Find out when the timing belt needs to be done ($$), check for a leaking RMS($$$), check for dark or smelly trans fluid, make sure the A/C works ($$$)
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