After playing the Forza Horzion demo, I've decided to getting into the driving sim genre. The feeling of just driving around exploring the world while watching the sun rise was fucking awesome, I've always wanted to get in my car and travel but can't in my financial situation right now, so the concept of exploring a realized Colorado is great to me. It brought back old memories of driving across the country to Jersey Shore one summer with friends, and the awesome feeling of being on your own, exploring new places, and satisfying the wanderlust.
Are there any good open world driving games out there that capture this feeling of exploration and feeling of adventure (for lack of a better word) well? I know next to nothing about the genre, would I be better off picking up Forza Horizon when it comes out or is there a better game out there for this?