OP I think you need to take a step back and think about this. If you were paying $415/mo for 60 months for your GTI that means you basically put nothing down. Also, sounds like you have negative equity in it currently.
On top of that, you are thinking about putting down a large sum of money on a lease which will still have high monthly payments and you will not own the car in the end. Sounds like you are setting yourself up for some financial trouble early in life...