As the man above says.......
DON'T DO IT!!Be patient and the right one will appear, in your price range and with the spec you want. You might have to travel but the wait will be worth it. I held out for about 6 months for the right one to come along. Travelled all over to look at some cars that turned out to be right turds, then
the one turned up 10 miles down the road, go figure.
Have a look through the "Cars For Sale" section on here and on other forums, some cracking cars to be had, generally owned by enthusiasts who have looked after their cars up and beyond the usual standard.
Have you considered saving a bit of cash and getting a standard GTI and then modifying it to your own personal spec.