Maybe I'm biased towards doctors in bigger/richer cities, but when I'm looking for investors, my first stop is doctors. Even the loans of a few hundred thousand are no problem for them to slay, especially since many get married to other similar high earners.
I don't know the most reliable sites for stating pay for doctors, but in my experience these numbers are accurate:
I would not put much stock into those numbers - for example, they are not even remotely close to who makes the highest - those are going to be neurosurgeons who start at over $250k and within a few years make close to a million - those numbers however should not be used for anything meaningful as there are so few of them.
Also, do remember that the doctors that do make that kind of money, have student loan payments on $250k-$500k loans