Well, Laguna Seca is 4 bucks while the season pass is 8 bucks. The season pass will have Donington Park and, whatever that is supposed to be, a rookie cup in the future. The rookie stuff sounds useless but the tracks are interesting. As the price for the season pass is the same as for 2 tracks and nothing else which is interesting is included I recommend you just go for the Laguna Seca DLC now and decide whether or not to add Donington once it's there.