In reply to blackreaver:
You want... a nine-day forecast??
[sucks teeth, looks dubious]
Might be a better idea to pack the guidebook and see how it looks when you get up there, who's on the routes that interest you, etc. (Prima facie, your own list looks pretty good to me.)
I will risk one prediction, even at this range: Gardyloo will have a monster cornice, unless it's just avalanched, and will be better left till April when things have tidied up a bit. This prediction is usually fairly safe...
Oh, and another: unless it's covered in unhelpful powder, which seems unlikely with all the wind and freeze-thaw we've been getting, Tower Ridge (IV, 3) is normally quite a safe bet. It's also quite a roomy route--little danger of people in front of you dropping stuff on you, and plenty of space on it for more than one party. At least, till you get to the Gap.
Post edited at 20:21