Well I will always support the 3.2, Ive owned mine for over 18 months and totally love it, so much I shipped it to OZ so cant say more than that lol.
Alot depends on your budget. As said before, the 2.0T can easily be tuned to death but at some point depending how far you go, you can experience some problem issues. On the other hand the 3.2 cant be tuned but bolt on a super charger and you deffo will smile! I always had plans to put a turbo on mine and hopefully will do someday but its alot harder to do over here.
Just remember that if you go 2.0T and spend all your bank account on tuning you will gain a good car but not much more fun than the 3.2 that will make you smile with its sound, smoothness and there is something about it that gets under the skin!!!!
I never found the fuel costs too bad tbh. On good runs I got over 34mpg and for me I was happy with that.
Whatever you choose, good luck but as sadi, test drive both esp the 3.2 with DSG, its special.