bowler
Your down jacket just might be the single most important choice that you make next to sleeping bag and rain gear.
The Nuptse is light and relatively worthless except as warm up for spring and fall, over say a fleece jacket.

Down doesn't weigh much, get as much as you can in your jacket and the shell on a Nuptse leaks. Don't try to save ounces on a jacket, thats like getting a sleeping bag with no stuffing to save weight. There are times where this go light idea is just anti-logical.
just my $.02
Jim