Which universities are best for a want to be psychiatrist?

Depends a bit on what you most want to do. You need a medical degree, a rotating internship, then a fellowship in psychiatry. Not surprisingly, schools such as Harvard, Yale, Texas at Austin, Minnesota, Northwestern, Washington, UCLA, Langley Porter, UC San Diego (going East to West) are all highly thought of. I might choose different schools for a child vs adult specialization. You should be sure that its really psychiatry rather than neurology, psychology or counselling that you most wish to pursue. Talk to the admissions officer at your local university, or a guidance counsellor if you're still in high school. Truly, it doesn't matter that much where you do your undergraduate medical degree, so much as it matters where you do your psychiatric residency. While graduating from a top ranked medical school might improve your chances of getting the residency of your choice, unless you intend to follow an academic/research career, no one will really care very much where you actually do your psychiatric training. Good luck