In reply to boingsplash:
I have the Berghaus Arete 45, great if you're on a budget, i've used it for all those things and it's been great. It doesn't have a separate lunch pocket like you mentioned as such, but for a "traditional" rather than lightweight rucksack it's fairly light and has quite a few features - rope clip, ice axe holders, H2O pouch etc. Also I got mine for only £55 which I thought was really good value.
Hope that helps