I've just bought a Trek 1.2 for a bit of training to increase my endurance and got it on the cycle to work scheme and i think its great. Really light and it eats the miles. It does take a bit of getting used to the seating position compared to a mountain bike.
I was in the same frame of mind as you were completely slating road bikers and saying i would never do it. I since went to the alps and after being destroyed up every hill by road mtbers that are also road bikers i took the plunge.
I'd definitely vouch for the Trek, great bike.