I would stay away from pattern one's as the one's i have seen are very thin and weak.
I got 2 good one's from breakers for £30,genuine and original,no rust.Not off a GTi though,they came off a CL with no wing aerial.If you do the leg work you may find some in matching colour but bear in mind that does'nt mean that they will be an exact match even if they come off a car made in the same year.
Some colours fade more than others so i guess it all depends on what colour you are looking for.
Pattern parts are renowned for bad fitting and poor quality.You can get good one's at a higher price but as there are plenty of good used one's still around my personal choice would be used one's which i could renovate if need be.You don't often get better than OEM stuff.