welcome to the site...
the reason you see so many Super GL cars is they lend themselves
very nicely to the look. There are many suspension upgrades for them
available in Europe seeing as they are used to racing more often then
standards. In addtion, with their curved windshields they appear more
modern as well.
As far as whether you should modify your currect VW, that is only for
you to decide, because in the end, you have to be happy with it, not us.
I would evalulate the cost of fixing that one up vs. selling it and buying
one in better shape. Body and paint work can be one of the most expensive
parts of restoration, other then a new engine. I have found that it is way
cheaper to bite the bullit and spend a few more thousand on a really nice
car, then to try to fix up a beater. I will never do the latter again!
Good luck!