Disclaimer (I do work for Adventure Inc so I am biased towards Osprey)
The Aether 70 should be a pretty good bet for you. Osprey is especially known for their big packs, an area where they have very dominant market share (USA) and the Aether and Xenith help build this reputation. It is a well spec'ed pack, which is still remarkably light weight for it's size and it also comes with custom fit in both back lengths and moldable hip belts. There much more but check out online.
I recon the biggest benefit we offer in ALL Osprey packs is our All Mighty Guarantee, which guarantee the packs for life. This is a true lifetime warranty, we will fix or replace ANY pack, regardless of when/where it was bought or how it got damaged.http://www.adventureinc.co.za/news/ospr ... guarantee/
Give me a shout if you have questions
p.s. It is worth noting that this warranty applies to 98% of countries where Osprey is sold. If you buy your pack in South Africa and pick up issues in USA or Europe you can contact the local agent and vice versa off course