In reply to dakidunn:
If you want light then as mentioned, the Scarpa Rebel Lite would be just about perfect. See
http://m.gooutdoors.co.uk/scarpa-rebel-lite-gtx-mens-boots-p277475
If they are not stiff or warm enough then look at the other boots in the Rebel range.
The Jorasses are great boots but as fully stiffened, insulated B3s they would just be a more modern replacement for the Nepals.
The only thing worth adding is that pretty much everything lightweight tends to have thinner (and often grippier) sole units than more traditional boots like the Nepals so they will tend to wear out quicker which may or may not be an issue depending on how long it will take you to rack up a hundred odd days in the mountains.
Post edited at 12:36