I was on the market for a new pack a couple of years ago and determined the Patagonia Ascensionist 40 was the best compromise between price and weight. Surprisingly weather resistant as well. It’s not perfect but it does carry well, strips down and was not as expensive as other packs in this class. If you’re a member of the AAC, you get a 20% discount at Patagoina.com
Not everyone loves this pack so you might check it out in person if possible.