I'm looking at Cannondale's site right now:
http://www.cannondale.com/bikes/08/cusa/model-8TR1.html
http://www.cannondale.com/bikes/08/cusa/model-8TR2.html
and I don't see any model with disc tabs. Otherwise the Cannondale frame would be high on my list. I'm still considering just swapping out a 700c fork with lowrider mounts and disc tabs and using it anways, and using cantis in the rear, as you suggested, but I'm not there yet.
As for disc brakes being heavy, they're pretty small, light, and simple these days - check out the Avid BB7 Road brakes for example.
The Crosscheck is a nice bike, but it's no loaded tourer. I'm looking for 450mm+ stays, and the ability to take real weight without becoming a noodle.