Take off the Timing belt cover, its actually a PITA on the 06's since they dont have the window like the rest of the MKV's. I just did mine at 64K a few weedends ago. Looked good just did it for peace of mind.
With that said you will want to replace it within the next 20k miles or less since its a 06 (almost 7 yrs old) or 80k. It will cost you around $900-1000 if you go through the dealer or if your mechanically inclined to do it yourself around $250 (just parts).
12K is on the high end for an stock 06 DSG. So if its CLEAN, good tires, breaks, oil change records, etc, etc then 12k is fair. Just remember that you have that timing belt change ~$1k coming up and a DSG flush ~$400-600. So factor that into your purchase. Good Luck to ya :thumbsup: