Be ready to have the common faults come and bite you on the ass;
-Window regulators will need replacing at some point to updated metal versions, unless receipts with car indicate already done.
-Make sure all your bushes are in good order, especially the rear axles. If they're worn, you'll notice a loud banging when going over any bumps in the road.
-Check your hoses are all good, with no leaks.
-Have a look around your engine bay to check for any oil leaks.
As you can probably pick up, I've replaced all these items, and lots of others, on my MK4 Golf GTi AGU in the last 5 years of ownership. But, as its the missus car I won't scrimp on any parts needing replacing. Thats why it still drives like new and I actually prefer driving this car around town than my Scooby.