In reply to samradcliff29:
Hey! So I just left that area only this week. I went with TrueTraveller for the whole trip and they actually added Acotango on their policy once I explained to them that it was a non-technical 6000er and covered the extra activity (extreme pack) for a week. I'm sure if you explain to them that Huayna Potosi is too, they'll likely add it.
Personally, I ummed and arred over doing Huayna Potosi or Acotango without insurance, and have been at over 3500m for at least a month now, but still felt that AMS or worse was still very much a possibility. Everyone on the trip was fine and didn't need to use the insurance, but it would have been very expensive if a rescue had been needed.
Also, we went with Pedro from Bolivian Mountaineering and I highly recommend him.
We went to Acotango as it is quieter mountain and Basecamp is a very rural little village in Sajarma national park, but Huayna Potosi looks mega! I hope you get to it and enjoy yourself! Oh and if you cycle the death road, Gravity Bolivia is the only company that takes you to the animal sanctuary at the end of the road! Very cool place.