Xbox 360 questions!And games!?

All games work on arcade, that is just the name for the most basic package (no hard drive) but that isn't essential unless you want to save demos and save your games. Personally i'd go with mirrors edge. It's a great game but it is a little short. Tomb Raider is great too. If I were you I'd look around and I'd bet you could pick up both games for under �20, try 'cheap afse gamer' it lists the cheapest prices of games