I'd like to stick with Trek or Specialized, Why? Because that's what my LBS carries and they've ALWAYS been good to me. Really good as far as prices go.
In addition, when I started going to the LBS they didn't treat me as a lard ass that was going to buy a comfort bike and they'd never see me again. They treated me like a human. Astounding. They've also invited me to their spinning classes on Friday nights and given me alternate routes for training for the Prouty (they're digging up the road and repaving). My LBS is great!