Time to retire my 5 year old Golite 70l Pinnacle pack.

Pinnacle is the pack I have used for 10-14 day trips.
It has been well and truly trashed!
Looking for something to replace it with.
Has to be LIGHT, has to be TOUGH. (Tassie tough!

(Could just get the 70l Jam but want to have a good look at options before I commit to anything.)
Has any one used MLD's 4400ci ARK
Wondering how those mesh pockets would stand up to bush bashing and rock.
http://www.mountainlaureldesigns.com/sh ... ucts_id=97
Have also thought about HMG's 4400 Southwest Pack. Not too sure how cuben would stand up to getting throw around places like the Eastern Arthurs.
http://www.hyperlitemountaingear.com/pa ... -pack.html
Has any one used cuben packs in this sort of environment???
Thoughts, suggestions???