Hi!
First of all, congratulations in all your admittances. Is a great pool of universities you have there.
Personally, I don't know the field you are seeking a graduate study (if Data mining was supposed to tell me something, sorry..i don't know what that is.. hehe :S)
I can tell you that I applied to UCLA and UTAustin, both of them in the Electrical Engineering field. I don't know much about job placement (I am a venezuelan living in Caracas so I don't have with me the best info).
From what I've seen in webpages, I thought I could give you my humble insight.
Carnegie Mellon is an extremely good university. If you stick by ranking (again, my saying in this is biased by the fact that I know about Electrical Engineering), CMU is the winner. CMU has a great reputation in two fields: Robotics and Information Technology (IT,networking).
UTAustin has a great reputation in Communications. It's one of the most competitive in this field.
UCLA is a great place for wirelees comunications and has a profile similar to UTexas.
UMaryland is unknown by me.
Also, I would like to take advantage of this to ask you about my status. I was accepted into UCLA's MSc in Electrical engineering. In this sense, I would like to ask _Hamlet_ why does he say that UCLA is the best choice. I think it can help me as well.
Another question I have, is that, I've also applied to UTAustin in the Electrical Engineering field but I have not received an answer yet. How did you hear from them? How long ago was it?
Thank you!