Hey chickentandoori, If u see in this website to the right top corner, there's a banner for INBS rotating with other banners, which just got launched recently. One of its main objective is to help people with questions like yours. I think you will find lot of resources there as well as answers to your specific questions from people pursuing similar fields. On a more general note, I would apply to Ph.D program that takes the most students rather than concentrating on just one track. Once you get in, its much easier to change tracks or work in labs that serves your interests!