I guess if I look at what you are interested in, which is a lot, I would say that ENT and EM are the most competitive. Eventually you will need narrow down to 1 or 2 fields that you want to go to. ENT is extremely competitive, more than probably ortho and rads. I think that your judgement is right in terms of what it takes to be competitive (i.e. board scores, clinical clerkship grades, research, etc.). Letter of recs are extremely important, especially from a reputable physician in the field that you are interested in. You really need to show the total package. Scoring well on the USMLE will be greatly increase your chances of landing a strong residency program in any of the fields you mention. Although I can't stand IM, I know that IM is non-competitive. Try to match in an IM program that has plenty of fellowships or gives you an excellent chance of landing one. The IM osteopathic programs are very weak.
For the past couple of years, anesthesia has been one of the most popular matches at my school, NYCOM. I've counted about 25-30 students per year matching into excellent anesthesiology programs throughout the country, such as NYU, Cleveland Clinic, Harvard, and Yale. Anesthesiology is now moderately competitives. Remember this, there are only about 2 anesthesiology DO programs. You'll need to apply allopathic. For ENT, apply both allo and osteo.