Don't worry about getting a graduate degrees from the same school. I found that where you get an MBA matters on your first job and what and where you want to work at. I got an MBA from UCLA's Anderson School of Business and when we were interviewing some of the top investment banks and management consulting firms, they only want to hire from Harvard and Stanford, but just made a cursory stop at our school.

I had a recruiter that told me point blank that they only hire from those schools and just came to our school for goodwill. Other than those top elite firms, all others were fine, as long as they know that the school has a good program. On the second job, it didn't matter any more.

Go for it. Everyone in our graduating class has done extremely well in life and career, and we have a strong alumni network that has lasted all these years. Best of luck to you.