I'll tell you in a few years
In truth, professors move and retire, and new stars are born. It's even possible that the Dark Matter question is settled by the time you're ready for grad school (dark energy would surprise me).
Yes, it's marginally advantageous to go to a more prestigious undergraduate school, because the recommenders will be better known, and the superior quality of the education will be assumed. I'd caution against choosing your college list too early based on tuition costs; financial aid packages can be surprising in their generosity. Tech is definitely not a bad choice, but I've noticed VA students seem to decide WAY too early where to go to school. When I taught high school in VA, I asked the freshmen in my Algebra class if they had thought about college--they all knew where they were going. That's not optimizing an important choice: you should become familiar with a range of schools with varying size and character, and make a decision that best fits you as a person.
EDIT: Advice, right! Well, I'd say it's never too early to get lab experience. I broke my first atomic force microscope the summer after my first year of college, which means I fixed my first atomic force microscope the summer after my first year of college. Early exposure lets you know what science is really about (the most important lesson I learned that summer was not to be a microscopist), and better prepares you to jump in the self-starter world of graduate school. If you have running dialogue with Tech professors, see if you can work in one of their labs in the summer--the details of the work itself doesn't matter so much at this stage, it's more about learning what working in a research lab feels like. And don't ignore programming: it's incredibly useful if you come into grad school with a working knowledge of a scripting/plotting language like Python as well as a fast object-oriented language like C/Fortran.