I've never met someone that liked Ga Tech. My friends were miserable there, and I don't really want to do that to myself. I have considered it in the past, and I love the suggestion, though.

Data Science I really considered, but the job situation is abysmal; each application has been getting like 200 or more applicants in that field (I know because I actively looked for a job there, got a bunch of interviews, but there's just too many applicants).

I could see myself going on to do a PhD in theoretical CS because it's a lot like math. I have thought A LOT about doing a PhD in theoretical mathematics, but I just don't love the idea of being so restricted in terms of movement and career. That, and I want my work to have an actual impact on society; a lot of math, even applied math, isn't really used (and yet I said theoretical CS. It's still a more applied field overall).