I want to buy a road bike, any tips?

I've had a nice mountain bike for some time but looking to get a road bike for riding on the road (already tried slicks on my mtb for six months and ready to splurge on a road bike). Any suggestions? I am looking in the $1400 range and preferably all carbon fiber although not against aluminum. I am a casual rider but would want to use it in some sprint triathlons