I can only speak for my experience, but word of advice:
> went to a top school
> "a graduate degree from Princeton/Yale, what could go wrong."
> more than half the class can't get jobs in the field.
> reminds me of everything I read about law school, turns out the stats are quite similar (and similarly doctored)
> realize half the class is just there to fund the program
> they actually paid students to post on these forums and help recruit
Also, everything you learn you could teach to yourself with an internet connection and a decent amount of drive.
Save your money if you don't get a good offer. I wish I had.