The frames for both the Cross Check and the Vaya weigh between 4.5 and 5lbs without the fork (assuming a 56). The disc fork on the Vaya will be heavier, not to mention the disc brakes, hubs and rotors. So with everything else being equal, the Vaya would be the heavier bike. If you don't need disc brakes, the Crosscheck or Casseroll would be your lighter choices.
If you'd like your cake and a disc brake too, you could always build a Crosscheck or Casseroll from scratch, with disc hubs, a disc fork and disc brake on the front only. I retrofitted my own commuter this way and love it.
__________________
"Let us hope our weapons are never needed --but do not forget what the common people knew when they demanded the Bill of Rights: An armed citizenry is the first defense, the best defense, and the final defense against tyranny. If guns are outlawed, only the government will have guns. Only the police, the secret police, the military, the hired servants of our rulers. Only the government -- and a few outlaws. I intend to be among the outlaws" - Edward Abbey
Last edited by chipcom; 05-13-10 at 12:01 PM.