One of the physicians I work with told me that if he had the chance to "do it over again," he would've become a pharmacist. Malpractice insurance premiums are ridiculus, and people seem to have a penchant for suing doctors, lately. If you want to become a doctor simply for the Benjies, you'll regret it, even if become nicely compensated. Financially, you could make a great living as a drug rep - without the headaches that doctors face (not to mention that you'll get a free car, with free gas).
Now, if you have other, motivational incentives to become a doctor besides $$$ (e.g. taking an active role in someone's healing process), then pursue medicine by all means. You'll live comfortably while doing something you enjoy.