I'm looking at Muztagh Ata or Lenin for summer of 2016. I am very comfortable with the gear setup I have now, and have had great success using it at over 6000m in a variety of conditions. I soloed Aconcagua with this setup last winter. I know that I need to ramp up my warmth for something higher and colder such Muztagh Ata or Lenin, but I'm unsure what would constitute overkill, or present me the best value.
My down outer layers right now are a Feathered Friends Volant Parka, and a pair of Feathered Friends Volant Pants. These two together are a sort of 'lightweight down suit' which is usually too warm to climb in. I layer these two with a Patagonia Nano Puff synthetic mid layer, two layers of merino on both torso and legs, a Patagonia R1 hood, and softshell pants. I had an unusually cold night on Aconcagua summit day, and was very comfortable.
My boots are Koflach Arctis Expe. I've replaced the liners with high volume Intuition liners, which are considerably warmer than the stock liners. I also have a pair of Purple Haze overboots for these, which are typically too warm to climb in. This combo is pretty solid, however I'm not sure if it's enough for higher given that my fingers and toes often seem to have circulation issues.
So, I really only want to buy one piece of warmth gear for next summer. I'm looking at the following options:
~ Go all the way, and buy a Feathered Friends Down Suit. Expensive, but my goal is an 8000m peak within a few years, so I'm pretty sure I'll get more use out of it in the future.
~ Get a warmer FF parka to replace my Volant Parka up high. Pair it with the Volant Pants. Probably the 'cheapest' option.
~ Get a new pair of boots. Seems like the least viable choice, as I'm unsure whether my Volant parka/pants are enough, even with top end Millet or La Sportiva 8000m boots on my feet.
Any advice is appreciated, thanks in advance!