I sold my mk6 gti last week [59, 5 door dsg with all the toys] and I must say it's the best car I ever owned. Bought it after it had done 50k miles and I tool it to over 102k, no issues apart from a random rattle. Mine was vw services every 10k, so I recommend one that has full service and been looked after.
I took a warranty for 1st year, just for peace of mind, might be worth doing depending on what you pay. No issues with tensioner and dsg is a dream.
GOLF R Estate on order, bring on June.....