I can't imagine you'd have any issues if you're planning to take a year off to medically transition. If your parents are open to it, I'd encourage you to get your name changed as soon as you're ready, so that you can bypass the whole process of having it changed after you're admitted.
I went to George Mason University in Virginia. Very open and accepting, very active LGBTQ campus groups and on campus resources. If they have academic programs that you're interested in and it seems like a school you'd like to go to, let me know and I can put you in touch with some friendly folks there. I did my Master's at the University of Delaware. I know they have an LGBTQ group on campus, but I was so busy with school and work that I never got too involved.
I honestly don't think you'll have any issues at most schools, especially if you're already looking into how LGBTQ friendly they are. The only thing I would tell you to think about is how out you want to be. The year off on T and top surgery will likely make you able to blend in and pass very well, especially if you're already passing. But if you're living in the dorms or dating, there's a chance that somebody will figure you out or tell other people. Decide how far out you want to be, and then mentally prepare to get pushed further out than that.