I also had the same question and asked it in the original thread discussing the 10/5/3 promo. I booked a few weekends at various locations, including the new W in Montreal. But the most expensive category 4 I found was The Atlantic in Ft. Lauderdale. The weekend I booked a room, the rates were well over $500US/night. I've yet to find a category four in the US with such high nightly rates.