MS CS in GT is not that selective a program. And until and unless you do pathbreaking research here, you will find it hard to get admitted to berkeley.
Although If you choose to attend MIT, it should be a betetr decision in view of your goals because Media labs at MIT is definitely a leader in the area and at MIT you definitely will get a chance to work across departments as well. So you might as wll get a change to work in conventional CS rather than the applied research in Media labs. Once you are in MIT, you can always request a change of major to CS as well, because of a shift of interest.
PS: thats just my point of view, I would like to hear from others.