We had a stove, shovel blade, belay parkas/pants, and some food. I'd spend a good bit of time at 14k to make sure you are well acclimatized. I'd also take a very warm (-20*) bag to 14K. I'd also leave a decent sized cache at 14K. That way if you find out that it's to far for you to make it in one push you could reteun to 14K, rest for a few days then move to 17K if need be.