Which Xbox console is right for me?

All right, i was thinking of getting a 4gb xbox 630 console with kinect, but i'm not sure if I should get a 250gb xbox instead because i dont know if a 4gb will have enough memory. I was thinking of getting around five games total which are Mortal Kombat, (a halo game, not sure whcih one yet, Battlefield 3, Darksiders 2, and Assassins Creed Revelations.