I have been looking at the ones on B&H as well. I'm waiting for a nice price drop.
I chatted with Samsung a week ago about the warranty and getting Samsung Protection Plus and they said, "I want to inform you that you can only purchase Samsung protection plus plan if it an US based phone. " So, I think the only option is a 3rd party company like SquareTrade.
In looking at the Q&A section on the B&H website, someone did ask if the phones come with a US warranty. A staff member replied, " No, this would come with a 1 year B&H warranty. This would cover all manufacturers software and hardware defects". I haven't had experience with B&H, but that's the best I've see for the International version (without having to spend extra money on insurance). The main thing I care about is being able to get a replacement, if for whatever reason something like the screen dies 4 months after I buy it.