There just really aren't that many specialties from which to select. You guys need to keep in mind the perspective of the med stud:
Surgery specialties comprise too much manual labor and studying anatomy all day is very boring. I also refuse to sacrifice 5-8 yrs of my prime years in residency to appease the fatcat, grey-hair surgeons. Can't stand in 1 spot for 8 hours.
FM/IM specialties involve dealing with fat, non-compliant smokers in clinic. Keep in mind the good patients who care about their health are in fact healthy and don't come to see you. You are left with nothing but Gomers. Endless rounds. IM subs make LESS than Hospitalist for MORE work, with the exception of GI, which is a disgusting field and will tank once scopes are cut.
Rads is being outsourced to India and IBM Watson. Path is boring and literally 0 jobs.
EM is gloried triage, don't need physicians for shotgun ordering/calling consults. Also have to deal with the very worst of society.
PMR - what do they actually do? People think you're a physical therapist.
Derm - did not go into med school for this. Also, very low barrier of entry for nurses, as the work is not difficult.
Neurology and OBGYN - don't think I need to explain these.
Peds - crazy parents, very low pay.
Psych - Crazy pts.
Rad onc - must have family connection and/or PhD to match. Must be willing to move cross country for residency or job. Will be replaced by med onc eventually.
Please tell me if I am missing anything. With GAS, I can expect to pull in 400K, interesting phys/pharm/pathophys, ACLS skills, fun to be facile with procedures, privacy, no pt follow up. Americans will always demand high quality anesthesia care.