I'm a massive fan of Goodyear f1 asymetricals. They are superb in the dry, stunning in the wet, fine in frosty conditions but not so great in the snow. I think the combination of wide tyres, an over active traction control system on a small car mean the gti is never going to be great in the snow. They tend to be the most recommended tyre out there for the gti and have won many of the recent tyre tests.