John Hopkins is the best of the best, I believe. They have excellent labs. They are researching things like localization of seizures and dynamics etc. Check it out here: http://erl.neuro.jhmi.edu/
Hope this helps a little. I’ll keep doing some research on other universities.

If you are very interested in a certain career, or you were in high school or elementary school, then you should look further into a branch of neuroscience that is related to that particular interest. If you don’t have an interest like that, then you should do as much research into any field of neuroscience that sounds interesting to you, then decide.