I think that the Suite Life rates at the Peninsula for the Superior and Deluxe Harbour View suites seem to be by far the best deal at the moment. The reservations department at the Pen sometimes allows back to back suite life bookings for longer stays.
Time permitting I would split the stay between the Peninsula and either the Mandarin Oriental or the Four Seasons. The Virtuoso offer for a confirmed double upgrade from a Harbour View room to a Deluxe Suite at Mandarin Oriental sounds very good.