Sorry, but running on may 2014, that seems a couple of (BTC) lightyears away.. What will you charge for electricity/management?
Those miners will not be profitable by May, they have already slipped from end of Feb delivery on other group buys, and started offering +25% hosted hashing as compensation (Which it doesnt even come close to compensating for two months lost hash power).
IMHO Anyone buying now at these prices is insane, BlackArrow will be forced to drop prices dramatically because of their delays.