I'm beginning to apply to grad schools (primarily in observational or computational cosmology and extragalactic astronomy) but have a deep interest in M-theory and quantum gravity although I haven't been able to study it. I very much enjoy theory and think that I would find studying M-theory or quantum gravity in grad school very fulfilling. However, I'm a bit overwhelmed by the number of grad schools available to apply to and how to choose which ones I would have a reasonable chance at getting into. I'm completing my undergraduate degree at a moderately sized state school (not known for research). I have a GPA of 3.87, 800 quant, 5 AW and 890 PGRE score (84th percentile). I have about a year of research under my belt including a full time summer of research. However, the research isn't directly related to quantum gravity. I'm absolutely open to move just about anywhere. I think I'd love to live somewhere else while attending grad school, so location isn't much of an issue. Where can I apply and have a reasonable chance of getting in?