Hello,

I have a little over 1000 GC now, and I am about to unlock the zenith series. I would like some advice on where GC is well spend, because I mostly want to have fun in this game ( and not worry too much about 10-lappers or other farming races, or about completing series as quickly as possible). So with fun I mean driving great cars in great races.
The only GC car I have is the 911 RSR 2013 bought with discount. 
Also: it seems that discount cars have completely disappeared?

Options are:
- Buy the Agera R with 20% discount in Speed Demons or in Zenith Series (I have the Agera for speed demons and the Veyron 16.4 for Zenith)
- Buy the Zonda R with 20 % discount in the same series
- Buy the Veyron Grand Sport, though it does not seem a great improvement from the regular veyron
- Fully upgrade my Agera to make it as much fun as a new Agera R would be
- Do the above with the Veyron
- Fully upgrade my 2014 Formula One car to have fun in Ferrari Evolution
- Buy the Porsche 919 2015 for 950 GC just like that, because it is a fun car to drive (though I can wait for the Audi 2014 for 3.2$). I will not able to complete the road to le mans for a free 919 2014 within a week, I do not have enough free time for that. 
- Keep the gold for later (sounds boring haha). 

Other suggestions are welcome of course and thank you very much for reading and responding to my question! :)