In reply to Roberttaylor:
We plan to approach on snowshoes. Myself and Robert both have quite a bit of experience of summer alpine climbs, also the Tien Shan and (in my case) the Pamirs. But neither of us have done any alpine climbs in winter - you don't have to read that much climbing literature to see that alpine winter is quite a different beast to alpine summer.
The key thing we are trying to decide is whether we need to splash out on plastic boots or not? My feet felt fine in my leather boots at 5000m in Tien Shan and Pamirs in summer, but of course that is not Alps in winter....