+2 on waiting for the new pack until you have the rest of your gear where you want it. Buy the pack to fit your new gear rather than your old.

Have you checked out the articles on the home page of this site, left-hand column?

I just saw a review of the Mountain Hardware Kanza pack today. It sounds good, especially with the various removable features, but very likely will be too big and heavy once you replace your sleeping bag.