XBOX 360!! games !?

hey i really want to buy a new xbox 360 game and do you kow any that are good? i already have halo 3 but do you kow any ones that are already out or is coming out that is like awesome. and i kind of like the games whre you can like get your guy better and evrythng! haha ok well HELP PLEASE!! just tel me some awesom games!! by!