Another consideration with flare is the angle of your shifters. I went with super flared Ritchey Beacons, but the flare meant that my shifters were angled inwards to an extent that I didn't like it. Rode them for a while but couldn't get used to it, so I went back to 12 degree flare.
I'd like to find bars where the 'flaring' occurs further down, so the shifters stay in a normal vertical position, but the drops are flared. However, it's difficult to tell if this is the case from just looking at pictures online.