You should look for signs of oil leakage on the struts, splatter if a drive shaft book is cracked, and VCG leakage. The strut and VCG issues are common. Dealer did my struts for $1,500 and I was only at 65K miles. If a boot goes, you're looking at about $1,000 for a new CV and remanufactured drive shaft. However, it only takes a couple minutes to spot any of these issues if you open the hood and crawl around a bit under the front end with a flashlight. Any excess oil on parts or grease splatters are a sign of maintenance issues to come.
I also 2nd the motion of pano roof problems (leakage or breakage) and vapor barriers. Sounds common although I have avoided by simply not using the pano roof.
Other random thoughts. TCM can drain battery if you have one (mine did and new battery needed every year untill it was properly diagnosed). Also, check under cabin air filter for crud in the drain holes (takes 15 seconds). If your drains get blocked you'll end up with a traveling swimming pool.
Last edited by shendrick; 01-23-2013 at 12:43 PM.