I'd encourage you to do some research here and on RBR's forums about disc brakes. With the right brake pads and rim brakes you should have enough braking power when you get caught in the rain. Unless you plan to commute on this bike, which you've said you don't want to do, I think they're overkill--and expensive and heavy to boot. They have their applications for sure, but not typically on your average roadbike. IMO of course.