Nothing wrong with asking questions Red, its the only way you'll learn about these games. I stick with rFactor, still many nice mods coming out for it. Project Cars and Ac look wonderful BTW, but you have to ask yourself, how long will you stick with the game? I use most games from the casual user catagory. Not so serious a user that a certain game will suck up every dollar I have. I don't need a G27 wheel, nothing wrong with it, just don't want to tie up so much money when I won't use it all the time. Whats the point? If you use driving sims all the time, then its a must have! But, if you are a casual player like me, you don't need a wheel like that.
Project Cars is coming out for the console near Christmas this year, don't know if AC will be for the console or not? If you are going to get Forza, from what I've been reading about it, get Forza 4, it has many more cars in it, the Forza 5.