Definitely OP don't hesitate to contact me. I went through the same things you're going through and I am going through things you will go through as well.

I saw that you got into Dartmouth (coinsidently that was the only Ivy I applied to but I got turned down), Brown, and GT. Its definitely a tough decision, don't get me wrong. I just want you to think about more than the money. There were some decisions I made that were based on money which I regret today. I had an opportunity to go on a 2 week study abroad program that cost ~$5k but I didn't go because of the money. My friends that went grew tremendously from it just being a two week trip. They learned and experienced things that I can't replicate with $5k. They had fun which I can't replicate with the money. They met people that I won't be able to meet.

A friend of mine go into an elite non ivy (I think Stanford or ND) but decided to go to a public ivy to save on money. He's a STEM major (something related to math). He was telling me about how much he hates being in a class with 100 students learning about math in a lecture where you can't even approach the instructor. You end up learning mostly from TAs and other peers. If you want to be taught by professors, an ivy with smaller class sizes is a must. That may not be the case at GT but I advice you look into class sizes, how grading works, how students feel about classes, and job opportunities before you make a decision.

The more I think about it the tougher the decision gets. I'm an incredibly cheap guy so the full ride is tempting, but theres something about an ivy league education that is too much to pass up.

Here are some statistics I found from UPenn regarding career plans. Here is one that is specific to the engineering school. Here is one from the class of 2014.