Triskelion - do your alpstars have velcro on the inside of the waist? Mine have an adjustment that you can cinch in the waist on them.
Sorry I led you astray on all the pants!
You should definitely take the down sweater. My current favorites for downs are the mountain hardwear phantom (very lightweight 800 fill), the cloudveil down patrol (windproof down with pitzips), and the mammut pilgrim jacket (hooded downy lusciousness).