I'd go with the biggest and best German touring car I could, even if I had to spend a bit more change.
Mercedes. There's one on the list in your price range.
Second- BMW. There are several (5).
If you can stretch the budget to go little further, go bigger Benz. You only live once.
I wouldn't be thinking handling for the Autobahn. I'd be thinking power, top speed, and luxury.
VW's are great, but no where near the Autobahn experience I'd want.
Oh, and 100 mph in a Geo is whacked. Absolutely nothing fun about that.

