My comfort zone has the top of the bars nearly flat, since I ride the hoods or top of the bar most of the time.
The brake levers are positioned with the tips of the lever in the same plane as the flats of the drops.
For me, having the bar rotated with a downward slope to the levers is not comfortable and I have had a couple of moments of panic when my hands slip forward. In additon, the angle of the hoods actually help keep my hands from going over the top. That happened to me once when I missed seeing a speed bump and face planted.
De Rosa in Riding configuraton on Flickr