I haven't used aftermarket versions much; I think, one set, I installed, was by the company "eagle eyes" and they seem, ok quality but defintiely, not oem. Oem, from what I have seen; are Bosch or Hella. I think, you can buy those brands, as a oem part without having to buy them from your VW dealer.
After installing the cheap aftermarket types; I would almost, rather restore a used set of genuine vw assembly, if broken or use a 3M headlight restore kit, for dull or sun damaged clear plastics. I think, many times; oem, is better then aftermarket, again, feedback might prove otherwise.
Brighter bulbs, do seem to make a difference; hopefully, someone can chime in and provide recommendations, for better bulbs and a good set of head light assemblies.
Hella:
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Bosch:
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