I've just bought a new bike, I had a really tough decision. My opinion of rim brakes are so poor, especially for a bike that would be predominantly used in the bad weather, that I was looking at options for a road bike with discs. Unfortunately, though there are a few brave manufacturers taking their first tentative steps in this area, the choice is pretty limited. I called Fatbirds (purveyor of titanium exotica) and they said one of the challenges of disc brakes on road bikes is the comparitively weak/flexible forks, meaning that wheel judder is a real problem.