In reply to geordiepie:
I've got a pair of Jorasses Pro and I would consider taking them to those sort of altitudes.
I would definitely take a pair of double boots with removable inner if I were you and going to a remote location like that. I once took a pair of Sportiva Baturas to the Karakorum. They got soaked through and once they got wet were near impossible to dry.
I would take boots like Sportiva Spantiks, Phantom 6000m or Scarpa Omegas (which can generally be picked up pretty cheaply). The Omegas aren't that waterproof and I would probably uses them with a glued on pair of Yeti gaiters.
HTH