Sorry I cant help you with Stiegl or Gösser too, but I can offer you minimum 7 kinds of beer from Franconia (Northern Bavaria). If you can, please bring Geuze or Kriek (no matter from which brewery, but no BelleVue) or Lindeboom in exchange.
Since Ive never heard of Stiegl and Gösser, I assume that these are very small Austrian breweries. And the smaller the brewery, the better te beer...
My beers also come from small breweries, so I think you would like them.
To fuzzelbärs question:
I don't even know, which bier I drank at my first party. We just went to a petrol station an bought something. The first crate of beer I bought was "Wolfshöher". It tastes quite well, but I bought it mostly because the 20-bottles-crate could be seperated into two half crates (with 10 bottles each), which was easier to carry. And I was young and had no car...
Now I drink mostly "Weißenoher" which is also my favourite beer in my favourite metalpub. When I stay at my parents' in Bamberg I drink all kinds of Bambergian beer. Bamberg is a small town of 70.000 people, but with 9 breweries, which brew together 29 different kinds of beer.
I enjoy some of the Bambergian beers even more than Weißenoher. Unfortunately the are only sold in Bamberg and not in Nuremburg (where I live), even if its only 60 km away.