One of the things I like about Claremont is the fact you get to choose electives. However, I do not know much about their placement. I was told only 30% of domestic students found jobs by the time they graduated. If your a top 5 or 10 students, you are guaranteed an internship. The school is beginning to develop relationship with firms on the East Coast. I know this because I talked to an alumni of the program after being accepted into the school. I have heard from others on QuantNet that they have a niche in the energy markets. If you are looking for diversity, this may be the most diverse school on your list (BU would be just as or slightly below).
I do not know much about OK St. But given the school's location, I bet you anything they have ties to many energy firms. This is just a hunch. You should call the director and ask for companies that actively recruit students in this specific track and internship/full time placement stats. Also, look at the curriculum to see if this is a "quant" program or a program that is closer to a MS in Finance.
The MSFM at Minnesota is new. I do not know much about it. However, I will say that their mathematics programs is one of the best in the country and the city itself is one of the best for young professionals. Many companies have their headquarter there, like Target, Cargill, Best Buy, and Allianz. However, not many financial institutions (US Bancorp is in Minneapolis). Also, lots of snow during the winter.
As for BU, a current student told me that the program is quite intense and that some courses are very theoretical. He said some of his friends were hired by the Big 4 (Deloitte, PWC). Not many banks and the people he knows ( which is not the entire class), have taken jobs that are less "quantish". Most of the career fairs were organized for the MBA students. However, the faculty and administrators of the program are some of the best I have talked to. They do not hide behind anything so if you have questions, they will give you answers.
My biggest advice is to call these programs. Ask to talk to the director and the career services center. Have them put you in touch with current and former students. Ask for statistics.