What kind of roads did you ride the Cannondale on? I know some AL bikes aren't as jarring, but I disagree that a good set of wheels will make an otherwise harsh bike more comfy. They'll help, but over a cross country tour, I'd be a little worried that it wouldn't be enough.
I'm glad you're open to all frame materials, but I'd cast a broader net for custom steel than just the Co-Motion. A good builder will be able to set you up on a steel frame well under 20 pounds that will offer a light bike for climbing AND a smooth ride. Get it built with rack mounts and clearance for fenders, and you can set it up as a tourer, too.
Chris King hubs are pretty. You know they make quite a bit of sound when coasting, right? They sound like angry bees. It'd be fine by me (my White Industries hubs are loud too), but it's not to everyone's liking. Of course, I'm still partial to my hubs. They're cheaper and just as pretty!
Live with intention. Walk to the edge. Listen hard. Practice wellness. Play with abandon. Laugh. Choose with no regret. Continue to learn. Appreciate your friends. Do what you love. Live as if this is all there is.
--Mary Anne Radmacher