Funny thing is, I'm not a big Audi fan at all, I always loved the gti from way back in the 80's, but not a car I "longed" to own, then out of sheer hatred for spending money on fuel, I traded my procharged 1500hd in on a new 11 mk6 golf tdi, and what can I say, I loved the little car, so much so that through circumstance I was lucky enough to (in a round about way) upgrade to an R
The mk5 (06-09) and the mk6 (10-14) have similarities, they really are completely different though. I bought my 11 tdi new, I drove the piss outta that car and it was a flawless functioning vehicle for almost 70k, then we traded it for the wife's car. I should have stated that the 2010 to current model year aka the mk6 platform, is the vw's I would look for, they are pretty bullet proof, electrical issues have all been worked out, transmissions were better, interior material is better, engine and head has been revised, they have a few minor issues that can be quickly addressed, as most all cars do, and there are several really good tuners out there that support the 2.0T TSI/FSI engine.
The VW mk6 golf platform has been a good and fun car for me