First of all, I'd like to thank everyone who has responded to my first two posts. The information about gear I am getting from you all has been a huge help in the buying process so far (got a great pair of Vasque boots and a Big Agnes Seedhouse SL 2 tent that is just too cool).
Now it is time to purchase my pack. I've looked at several at my local outdoor outfitter and I have narrowed it down to a few brands. I love the Osprey and Gregory packs in particular. Aether 70 and Baltoro 70 models, respectively. Any first-hand knowledge about these brands and/or models would be greatly appreciated. Useful features, the little things that make them nice, drawbacks, whatever. I'm also open to suggestions about other brands. Thanks in advance!