User Review: Mountainsmith Specter
Price Paid: $180
No longer made, so they are probably pretty hard to find, but this is an outstanding pack. It's, big, lightweight and sturdy.
It's very comfortable and has a lot of great features. Includes a removal (small) daypack, J zipper, good venting, etc. You usually sacrifice things like the extra zipper and daypack on lightweight bags, but that's not the case here.
No complaints and it has held up well through about 5 years of occasional use for both backpacking and international traveling.