I personally like the CiloGear alpine packs, they come in various sizes and they are very customizable based on your various measurements. They are a bit more expensive than most, and the Woven/Non-Woven Dyneema packs are very expensive. I have never had any problems with my packs and they probably get 100+ days per year of use.
I would also look at Hyperlite and Alpine Luddites.