kwam don't worry about the visa regulations, because internationals can enter USA 30 days before the required part of the MBA starts. The required part of the program starts usually 10 days before classes begin, so I assume alll internationals will be able to come to the USA mid July at the earliest.
At Ross for example, our required stuff starts from August 21st, so Rossies can enter the US at July 22nd at the earliest.
As I already mentioned, probably no internationals coming to USA will be too early in august because of VISA issues, so I voted to the 16th.
GO BLUE !!!