Ive done 56k mines been done twice, once under warranty, just had it done last month as it had passed 4 years, but only 30k.
Paid £404 for cambelt, waterpump, tensioner, pulleys, at main dealer.
Check:
Service History - ideally on time and distance, every 10k, with Long life oil.
Cambelt - 4 years or 60k
DSG - oil & filter every 40k regardless!!!!!
DSG - check service history has it had mechatronics.
Check DSG for jerky changes, test through all gears, stop move between D & R and move the car abit each time.
Spark plugs - these only get changed by VW at 60k (apparently they are long life) I had mine changed when i found this out.
Check wings, sills, boot handle for corrosion.
Check interior seat bolsters can wear, if leather scuffed, leather repair kits can hide the marks.
Have a priority spec list then a nice to have. Lots of things can be retro fitted, ie RNS sat nav, MFSW, armrest, MDI connection etc..