Board Thread:Game Discussion/@comment-27170954-20160105193404/@comment-26580830-20160105200628

I put together an outline of what I what I needed to buy an when to help me work out just that issue. I particularly wanted to concentrate on opening up all the series for a little GC as possible. You can 'skip' many of the Bonus series and come back to them later, but Speed Demons was the big one for me as you should pick up both the Porsche 911 RSR (2014) and the Koenigsegg Agera R for GCs in order to use them later. The other obvious one is Masters of Speed, which the 911 (2014) will get you into, as you'll need to pick up either the Aston Martin Vantage GTE or Porsche 911 RSR (2015) for later. (I got the GTE on sale, but also if you choose that over the 911, you can pick that up in a later Bonus Series.)

One other note is I've just proved to myself that you can get through Spirit of Ferrari without getting the Ferrari 599 GTO or spending GC, but you'll need all but two R$ upgrades on the Ferrari Enzo Ferrari. (I'm about to write up my report on that.)

Hope this helps.