I want to do hep-th in grad school (like everyone else!). My school doesn't have anyone working in formal hep-th, so I need to take a roundabout track in research (I've been working in cosmology recently). I have two options: work with a well-known prof in CMT (very mathematical) work with a less known prof in hep-ph (blending experiment and theory) which seems better suited if I'm aiming for hep-th in grad school? The math that I'd get in the CMT research would be nice, but the hep-ph research might be a little more topical. Any thoughts?