Hi fuzzylogician, thanks for your reply.
Yes, a top theory school is what I'm looking for. I'm interested in the language & the brain, speech perception, the lexicon, sentence processing, discourse, speech production and language acquisition (both first and second)...so basically everything. Is it a must for me to narrow down my interests to one subfield only? I want to continue to do research after my PhD graduation, and I thought it would be better for me if I keep my options open so that I can get involved in a wider range of topics and research later in my life. At the moment behavioral tasks and neuroimaging seem pretty cool to me.
Sorry for being vague but you see I'm still in my first stage of planning, so I don't know much about the details yet, and please walk me through or correct me if I have any misconceptions. I hope I can gain some insights through this forum. Also, an extra piece of information: I still have 2 more years of undergrad to go, and the earliest application I'll be able to send out will be in the fall of 2019.